1 00:00:07,040 --> 00:00:07,907 My name 2 00:00:07,907 --> 00:00:12,712 is John Gallin and I'm the director of the Clinical Center 3 00:00:12,712 --> 00:00:18,852 and a co-organizer of this course. So, the topic that I'm going to cover 4 00:00:18,852 --> 00:00:23,656 is an overview of the history of this business, which is, 5 00:00:23,656 --> 00:00:28,895 after all, risky business for the patients, as well as big business 6 00:00:28,895 --> 00:00:32,832 for the pharmaceutical industry and the biotechnology industry. 7 00:00:32,832 --> 00:00:37,203 But we can learn a lot from going back 8 00:00:37,203 --> 00:00:42,008 to the beginning and seeing some of the things that happened. 9 00:00:42,008 --> 00:00:45,311 So, I will try to give you a survey. 10 00:00:45,311 --> 00:00:49,716 It's sort of a hobby of mine and I enjoy it. 11 00:00:49,716 --> 00:00:54,487 And I want to just say, right out front at the beginning, 12 00:00:54,487 --> 00:00:58,158 that it's impossible to cover everything and to recognize everyone. 13 00:00:58,158 --> 00:01:00,360 And if I omitted your favorite 14 00:01:00,360 --> 00:01:05,498 historical feature, you can tell me, and next time I'll try to include it. 15 00:01:05,498 --> 00:01:09,903 But I apologize, but there's literally thousands of thousands 16 00:01:09,903 --> 00:01:14,307 of superstars that make this a wonderful story. 17 00:01:17,010 --> 00:01:21,614 So, let me start with the definition of clinical research. 18 00:01:21,614 --> 00:01:28,455 And this is not a historical definition, but it sets a perspective for the course. 19 00:01:28,455 --> 00:01:35,795 This was produced at NIH in 1996 in a special panel that met here and divided 20 00:01:35,795 --> 00:01:38,531 Clinical Three research into three broad 21 00:01:38,531 --> 00:01:40,366 categories: patient-oriented research, epidemiologic 22 00:01:40,366 --> 00:01:45,371 and behavioral studies, and outcomes research, and health services research. 23 00:01:45,371 --> 00:01:50,410 So, patient-oriented research, which is the one we most frequently 24 00:01:50,410 --> 00:01:56,349 think about if we're doing clinical research, is research conducted with human subjects 25 00:01:56,349 --> 00:02:00,920 or a material of human origin, such as tissues, specimens, 26 00:02:00,920 --> 00:02:05,525 and cognitive phenomena for which an investigator or a colleague 27 00:02:05,525 --> 00:02:10,997 directly interacts with human subjects, and includes the development of new technologies, 28 00:02:10,997 --> 00:02:16,035 mechanisms of human disease, therapeutic interventions, and clinical trials. 29 00:02:16,035 --> 00:02:20,440 So, these three categories -- patient-oriented research, epidemiologic, 30 00:02:20,440 --> 00:02:25,945 and behavioral studies, and outcomes research, and health services research 31 00:02:25,945 --> 00:02:32,552 -- is what you're going to be thinking about during this course. 32 00:02:34,621 --> 00:02:36,990 So, I love this quote, 33 00:02:36,990 --> 00:02:44,531 which comes from Isaac Newton, who, in 1676, wrote, "If I have seen a little further, 34 00:02:44,531 --> 00:02:51,137 it is by standing on the shoulders of giants." And that's applicable to anyone 35 00:02:51,137 --> 00:02:56,309 who's succeeded in doing clinical research over the many millennium. 36 00:02:56,309 --> 00:03:00,547 It's hard to know when clinical research started. 37 00:03:00,547 --> 00:03:05,251 But in 2850 B.C., Imhotep, who was a known scribe, 38 00:03:05,251 --> 00:03:11,391 a chief lector, and a priest, an architect, astronomer, and a magician -- 39 00:03:11,891 --> 00:03:18,364 and in those days, medicine and magic were used together -- he diagnosed 40 00:03:18,364 --> 00:03:23,870 and treated over 200 diseases, performed surgery, and practiced some dentistry. 41 00:03:23,870 --> 00:03:28,841 And he extracted medicine from plants and knew the position 42 00:03:28,841 --> 00:03:34,814 and function of the vital organs and circulation in the blood system. 43 00:03:34,814 --> 00:03:37,817 So, this was 2850 B.C. 44 00:03:37,817 --> 00:03:44,290 The Chinese -- here we are 2737 B.C., according to the source 45 00:03:44,290 --> 00:03:48,494 that I had -- were also exploring medicine. 46 00:03:48,494 --> 00:03:53,299 Emperor Shen Nung experimented with poisons and classified medical plants. 47 00:03:53,299 --> 00:04:00,006 He's reputed to have eaten 365 medicinal plants over the course of his life. 48 00:04:00,006 --> 00:04:03,343 Supposedly, he turned green and died. 49 00:04:03,343 --> 00:04:10,516 Now, I'm going to go through some examples as I go through this talk. 50 00:04:10,516 --> 00:04:15,321 And, some of them, I will go from the ancient 51 00:04:15,321 --> 00:04:19,626 to the present, just to give you a perspective. 52 00:04:19,626 --> 00:04:26,599 And one of them is malaria, which is an ancient disease 53 00:04:26,599 --> 00:04:32,272 first described in China in ancient medical writings. 54 00:04:32,272 --> 00:04:39,212 In 2700 BC, several characteristic symptoms of malaria were described 55 00:04:39,212 --> 00:04:44,917 in the Nei Ching, and a plant called Qinghao 56 00:04:44,917 --> 00:04:50,590 or Artemisia annua was described in some medical treatises, 57 00:04:50,590 --> 00:04:57,530 and 52 remedies were advocated as found in the Mawangdui Tomb. 58 00:04:57,530 --> 00:05:03,236 In 340 AD, the anti-fever properties of this plant, 59 00:05:03,569 --> 00:05:09,575 Qinghao, was first described by Ge Hong in the East Yin Dynasty. 60 00:05:09,575 --> 00:05:14,080 And the active ingredient, known as artemisinin, was recently 61 00:05:14,080 --> 00:05:19,585 isolated by a Chinese scientist, Professor Tu Youyou, in 1971. 62 00:05:19,585 --> 00:05:24,090 And I had a chance to meet Dr. 63 00:05:24,090 --> 00:05:30,630 Youyou because she received the Lasker Award in clinical research in New York, 64 00:05:30,630 --> 00:05:37,637 the same year that the Clinical Center received the Lasker Award in public service. 65 00:05:38,971 --> 00:05:40,707 And she said that 66 00:05:40,707 --> 00:05:45,978 what she did was she was asked, apparently by Mao [spelled phonetically], 67 00:05:45,978 --> 00:05:51,551 earlier, to find some medicines for malaria because the Chinese Army needed these 68 00:05:51,851 --> 00:05:53,453 where they were going. 69 00:05:53,453 --> 00:05:56,522 And she went to this old literature 70 00:05:56,522 --> 00:06:01,794 and found that this Artemisia plant was reported to be helpful. 71 00:06:01,794 --> 00:06:07,066 And she went back to the original readings and, with her 72 00:06:07,066 --> 00:06:11,471 colleagues, the biochemical structure, which is shown here, was identified. 73 00:06:11,471 --> 00:06:14,107 And she developed this new drug, 74 00:06:14,107 --> 00:06:18,511 which has literally saved millions of lives throughout the world. 75 00:06:18,811 --> 00:06:24,384 And just this month, she received the Nobel Prize for this work, 76 00:06:24,384 --> 00:06:29,489 the first Chinese investigator to ever receive a Nobel Prize. 77 00:06:29,489 --> 00:06:35,061 I'm also going to tell you about some of the areas 78 00:06:35,061 --> 00:06:39,699 of medicine, and we'll spend a few minutes on surgery. 79 00:06:39,699 --> 00:06:42,935 Sushruta is the father of Indian surgery 80 00:06:42,935 --> 00:06:47,607 and, many would say, was perhaps the father of surgery. 81 00:06:47,907 --> 00:06:52,512 He lived about 600 BC, although this was not completely clear, 82 00:06:52,512 --> 00:06:56,682 and lived with the era of the Gupta kings. 83 00:06:56,682 --> 00:07:02,121 He wrote medical text about surgery and is most famous -- Sushruta 84 00:07:02,121 --> 00:07:06,726 Samhita is literally an encyclopedia of medical learning from his day. 85 00:07:06,726 --> 00:07:12,165 He counted the bones in the body, and he came up with 300. 86 00:07:12,165 --> 00:07:16,769 Does anybody in the audience know how many bones people think 87 00:07:16,769 --> 00:07:22,975 are in the human body today, or know that are in the human body today? 88 00:07:22,975 --> 00:07:23,810 No respondents. 89 00:07:23,810 --> 00:07:25,845 So, I'll make it easy. 90 00:07:25,845 --> 00:07:29,982 It's -- it depends on when you take the measurement. 91 00:07:29,982 --> 00:07:33,252 At birth, it's said there's about 300 bones. 92 00:07:33,252 --> 00:07:39,425 And then, the bones fuse, so that in the adult there's probably about 206 bones. 93 00:07:39,425 --> 00:07:41,461 So, he was remarkably accurate. 94 00:07:41,461 --> 00:07:43,930 Remember, this is 600 BC. 95 00:07:43,930 --> 00:07:48,034 He also realized the importance of keeping wounds clean. 96 00:07:48,301 --> 00:07:54,173 He did not use the word sterilization, but he talked about clean wounds. 97 00:07:54,173 --> 00:07:58,711 And he discussed options for instruments in surgery and concluded 98 00:07:58,711 --> 00:08:02,815 that the hand was the best instrument available. 99 00:08:02,815 --> 00:08:10,056 So, you can go to all sorts of places to get insights into clinical research. 100 00:08:10,056 --> 00:08:12,792 And, perhaps, the earliest so-called trial, 101 00:08:12,792 --> 00:08:18,097 as I'll call it, comes from the Bible, the Book of Daniel. 102 00:08:18,097 --> 00:08:22,301 And Daniel said, "Test your servants for 10 days 103 00:08:23,369 --> 00:08:24,203 and let 104 00:08:24,203 --> 00:08:28,841 us be given vegetables to eat and water to drink." 105 00:08:28,841 --> 00:08:34,714 Now, "us" is a group of Jews who were captured by the Egyptians. 106 00:08:34,714 --> 00:08:39,352 And they didn't want to have to eat the non-kosher food. 107 00:08:39,352 --> 00:08:41,454 And so, he was clever. 108 00:08:41,454 --> 00:08:45,691 And so, to avoid that, he said, "Conduct this test. 109 00:08:45,691 --> 00:08:49,896 So, give us vegetables to eat and water to drink, 110 00:08:49,896 --> 00:08:53,699 and compare your servants who will get rich foods. 111 00:08:54,033 --> 00:08:58,638 So, then, let our appearance and the appearance of the youths who eats the king's 112 00:08:58,638 --> 00:09:03,576 rich food be observed by you, and according to what you see, deal with your servants. 113 00:09:03,576 --> 00:09:07,847 So, he harkened to them on this matter and tested them for 10 days. 114 00:09:07,847 --> 00:09:11,551 And at the end of 10 days, it was seen that they, 115 00:09:11,551 --> 00:09:15,821 the ones who ate the vegetables and water, were better in appearance and fatter 116 00:09:15,821 --> 00:09:19,525 in flesh than all the youths who ate the king's rich foods. 117 00:09:20,026 --> 00:09:25,598 So, the steward took away their rich food and the wine 118 00:09:25,598 --> 00:09:30,670 and gave them vegetables." So, this is in the Bible. 119 00:09:30,670 --> 00:09:33,372 There's no informed consent. 120 00:09:33,372 --> 00:09:40,313 But, perhaps, the greatest mind in early medicine and clinical research 121 00:09:40,313 --> 00:09:46,886 was Hippocrates, who was born about 460 BC and died about 370 BC. 122 00:09:46,886 --> 00:09:50,957 And you all know about the Hippocratic Method. 123 00:09:50,957 --> 00:09:53,993 And what Hippocrates advocated was observation. 124 00:09:54,894 --> 00:10:01,167 And he said, "A great part of the art is to be able to observe." 125 00:10:01,167 --> 00:10:06,372 And he recorded a whole -- over 100 descriptions of clinical situations. 126 00:10:06,372 --> 00:10:10,776 Let me read you one, his description of pulmonary edema. 127 00:10:10,776 --> 00:10:16,616 He said, "Water accumulates; the patient has fever and cough; the respiration is fast; 128 00:10:16,616 --> 00:10:21,654 the feet become edematous; the nails appear curved; and the patient suffers 129 00:10:21,654 --> 00:10:26,659 as if he has pus inside, only less severe and more protracted. 130 00:10:27,393 --> 00:10:31,764 One can recognize that it is not pus, but water. 131 00:10:31,764 --> 00:10:37,003 If you put your ear against the chest, you can hear it 132 00:10:37,003 --> 00:10:40,940 seethe inside like sour wine." So, this is incredible. 133 00:10:40,940 --> 00:10:46,178 And I've had a chance to read a bunch of his descriptions 134 00:10:46,178 --> 00:10:51,651 and they're remarkable for how accurately he observed and described his patients. 135 00:10:51,651 --> 00:10:54,487 So, he had some amazing accomplishments. 136 00:10:54,487 --> 00:10:57,523 He dissociated medicine from theology and philosophy. 137 00:10:57,523 --> 00:11:01,827 He really established the science of medicine and, of course, 138 00:11:01,827 --> 00:11:06,565 he provided physicians the highest moral inspiration that they have. 139 00:11:06,565 --> 00:11:10,036 Wound management is something he wrote about. 140 00:11:10,036 --> 00:11:16,509 And he said, "If water was used for irrigation, it had to be very pure 141 00:11:16,509 --> 00:11:22,548 and boiled, and the hands and nails of the operator were to be cleansed." 142 00:11:22,882 --> 00:11:27,853 This was long before anybody recognized infection, infectious diseases. 143 00:11:27,853 --> 00:11:30,890 And this was from Hippocrates. 144 00:11:30,890 --> 00:11:38,898 So, you're going to see that we're going to be going around the world 145 00:11:38,898 --> 00:11:44,970 and hearing about investigators or champions of clinical research from everywhere. 146 00:11:44,970 --> 00:11:49,942 And let's focus on Iranian medicine for a moment. 147 00:11:49,942 --> 00:11:54,380 There were two individuals, Al-Rhazi and Ibn Sina. 148 00:11:54,380 --> 00:11:58,217 So, Rhazi lived about 865 to 925. 149 00:11:58,217 --> 00:12:04,290 And he discovered use of alcohol and mercurial compounds as antiseptics. 150 00:12:05,458 --> 00:12:07,727 He made numerous contributions 151 00:12:07,727 --> 00:12:12,264 to medicine, as well as alchemy and philosophy. 152 00:12:12,264 --> 00:12:17,369 But he actually wrote the first treatise on pediatrics 153 00:12:17,369 --> 00:12:23,342 and this was recorded in over 184 books and articles. 154 00:12:23,342 --> 00:12:32,151 Now, Ibn Sina, or Avicenna, as he was called, lived from 973 to 1037 AD. 155 00:12:32,151 --> 00:12:38,390 And he was a leader in pharmacy, philosophy, medicine, and pharmacology. 156 00:12:38,390 --> 00:12:44,630 And he was the principle author of the Canon of Medicine, 157 00:12:44,630 --> 00:12:48,601 which was the main European medical textbook. 158 00:12:48,868 --> 00:12:53,005 It had been modified, obviously, over the centuries, but 159 00:12:53,005 --> 00:12:58,043 it was active particularly from the 14th to the 16th century. 160 00:12:58,043 --> 00:13:03,115 And this book contains the first known treatise on clinical trials 161 00:13:03,115 --> 00:13:07,887 and provided the foundation for systematic approach to drug testing. 162 00:13:07,887 --> 00:13:15,995 And I just want to go over with you what was said back then, around 1000 AD. 163 00:13:15,995 --> 00:13:18,764 So, the seven conditions for experimentation: 164 00:13:19,765 --> 00:13:20,633 first, if 165 00:13:20,633 --> 00:13:25,371 you want to experiment with something, it should be pure; second, 166 00:13:25,371 --> 00:13:30,976 the drug must be tested for only one condition at a time; third, 167 00:13:30,976 --> 00:13:36,582 drugs must be tested in contradictory disease states; fourth, strength of a drug 168 00:13:36,582 --> 00:13:41,320 must be a proportionate to the severity of the disease; fifth, 169 00:13:41,320 --> 00:13:44,356 time of therapeutic effect must be considered; 170 00:13:44,356 --> 00:13:48,661 sixth, drugs must be observed for continued action; and, seven, 171 00:13:48,661 --> 00:13:52,531 a drug must be tested in humans before judgment. 172 00:13:53,199 --> 00:14:00,272 So, this is pretty amazing when you think of when these conditions were defined. 173 00:14:00,272 --> 00:14:05,911 So, now I'm going to be skipping a couple of centuries 174 00:14:05,911 --> 00:14:10,149 and start talking about anatomy and, to my thinking, 175 00:14:10,149 --> 00:14:14,854 one of the greatest early anatomists was Leonardo da Vinci. 176 00:14:14,854 --> 00:14:20,492 This is the only self-portrait of him that's known to be available. 177 00:14:20,492 --> 00:14:24,730 He did this near the end of his life. 178 00:14:25,297 --> 00:14:28,934 And if you go through his works 179 00:14:28,934 --> 00:14:35,708 and you look at his descriptions, drawings of the human anatomy, it's really quite 180 00:14:36,675 --> 00:14:40,846 phenomenal, and here are a couple of pictures. 181 00:14:40,846 --> 00:14:47,086 The microscope was an important addition to medicine in clinical research. 182 00:14:47,086 --> 00:14:53,826 So, let me tell you, in a slide, a little about the microscope. 183 00:14:53,826 --> 00:14:59,531 In the 1st century AD, glass was tested by the Romans, 184 00:14:59,531 --> 00:15:07,306 who recognized when thick in the middle and thin at the edges, you got magnification. 185 00:15:07,306 --> 00:15:12,511 Ibn al-Haytham, who lived in Egypt, was the father of optics. 186 00:15:13,178 --> 00:15:16,382 He was also a great astronomer. 187 00:15:17,416 --> 00:15:20,619 The 13th century eyeglasses were invented. 188 00:15:20,619 --> 00:15:25,391 The first eyeglasses were made in Germany in 1286. 189 00:15:25,391 --> 00:15:30,696 In 1590, Zacharias Janssen and his son, who were Dutch, 190 00:15:30,696 --> 00:15:36,001 invented the compound microscope with two lenses in a cylinder. 191 00:15:36,001 --> 00:15:40,239 And in 1609, Galileo added a focusing device. 192 00:15:40,239 --> 00:15:44,777 And that was the beginning of the microscope. 193 00:15:44,777 --> 00:15:52,451 But it was Antonie van Leeuwenhoek who first used a microscope in clinical research. 194 00:15:53,519 --> 00:15:57,690 He lived in the 1600s to the 1700s. 195 00:15:57,690 --> 00:16:01,894 And he worked in a dry goods store 196 00:16:01,894 --> 00:16:06,598 and he needed to count the number of threads 197 00:16:06,598 --> 00:16:11,837 in a inch or in a certain amount of space 198 00:16:11,837 --> 00:16:17,576 to judge the quality of the linens that were being produced. 199 00:16:17,576 --> 00:16:24,917 And so, he made special small lenses, which could magnify up to 270 power. 200 00:16:25,651 --> 00:16:29,989 And in the bottom of the slide is his first microscope. 201 00:16:29,989 --> 00:16:37,463 And I got a facsimile of that that I found in a small store in Maine, of all places. 202 00:16:37,463 --> 00:16:43,769 And you can see, this is the lens, and you can put an object on it, 203 00:16:43,769 --> 00:16:49,274 and you look through the other side, and position your object with this screw. 204 00:16:49,742 --> 00:16:53,946 In using this, he described the first bacteria, yeast, 205 00:16:53,946 --> 00:17:00,019 sperm, striated muscle, crystalline lens of the eye, and red cells, among others. 206 00:17:00,019 --> 00:17:02,821 And you can imagine sitting there 207 00:17:02,821 --> 00:17:07,926 and looking at a light, and then making drawings of this. 208 00:17:07,926 --> 00:17:09,795 It's really quite phenomenal. 209 00:17:12,297 --> 00:17:14,900 So, having described red cells, 210 00:17:14,900 --> 00:17:19,571 it makes me want to bring to your attention 211 00:17:19,571 --> 00:17:24,810 William Harvey, who lived in England from 1578 to 1657. 212 00:17:24,810 --> 00:17:28,981 And he was the one who really defined 213 00:17:28,981 --> 00:17:33,152 the circulatory system in great detail and accuracy. 214 00:17:33,152 --> 00:17:38,357 In the same period, a little later, Sir Christopher Wren, 215 00:17:38,357 --> 00:17:45,130 who you probably know for his architecture, he also invented the intravenous needle. 216 00:17:46,698 --> 00:17:50,903 It was made out of sterling silver. 217 00:17:50,903 --> 00:17:59,878 And he connected the bleeder, the needle to the urethra, and infused dogs with opiates, 218 00:17:59,878 --> 00:18:04,683 and was the first to describe the effects 219 00:18:04,683 --> 00:18:08,887 of intravenous opiates in a mammal. 220 00:18:08,887 --> 00:18:15,461 He also gave the needle to a friend of his, 221 00:18:15,461 --> 00:18:21,467 who's shown on the bottom of this slide, Richard Lower, 222 00:18:21,467 --> 00:18:28,674 who in 1667, did the first transfusion into man using sheep's blood. 223 00:18:29,274 --> 00:18:36,548 And the man survived, probably because he only gave about 10 cc's of blood. 224 00:18:36,548 --> 00:18:43,288 And a few months earlier, Jean-Baptiste Denys, in France, gave about the same, 225 00:18:43,288 --> 00:18:49,495 or 12 ounces of sheep blood into a 15-year-old boy who survived. 226 00:18:50,529 --> 00:18:53,665 But the first use of man-to-man, 227 00:18:53,665 --> 00:18:58,837 or man-to-women, or -- transfusion was by James Blundell, who, 228 00:18:58,837 --> 00:19:05,077 in 1828, did a number of transfusions without any typing and cross-matching. 229 00:19:05,077 --> 00:19:10,282 And about half of the 12 subjects he described survived. 230 00:19:10,282 --> 00:19:17,022 And he was able to show in this etching, which appeared in Lancet 231 00:19:17,022 --> 00:19:23,228 in 1828, that he could save a person who was exsanguinating after 232 00:19:23,228 --> 00:19:29,468 -- a woman -- after a uterine operation that wasn't going well. 233 00:19:29,468 --> 00:19:31,670 He saved her life. 234 00:19:31,670 --> 00:19:38,777 Of course, the advent of blood types was not until 1900, when Karl Landsteiner, 235 00:19:38,777 --> 00:19:44,650 who was working at The Rockefeller University, defined the A, B, O, 236 00:19:44,650 --> 00:19:46,618 and AB blood types. 237 00:19:46,618 --> 00:19:51,523 And that was the beginning of really the modem transfusion 238 00:19:51,523 --> 00:19:54,226 medicine approached that we have. 239 00:19:54,226 --> 00:19:58,397 Now, in terms of modern terminology or thinking, 240 00:19:58,397 --> 00:20:03,268 maybe the first clinical trial was done by James Lind. 241 00:20:03,268 --> 00:20:07,206 And he worked in England in the 1700s. 242 00:20:07,206 --> 00:20:14,046 And at that time, scurvy was a major health problem in the British Navy. 243 00:20:14,913 --> 00:20:18,617 And William Harvey, who I had mentioned earlier, 244 00:20:18,617 --> 00:20:23,255 had recommended lemons to treat scurvy, but had argued that 245 00:20:23,255 --> 00:20:28,827 the therapeutic effect was the result of the acid in the fruit. 246 00:20:28,827 --> 00:20:35,767 And it was Lind, who was a Naval surgeon, conducted a clinical trial in 1747 247 00:20:35,767 --> 00:20:40,172 to assess the utility of three therapies on scurvy. 248 00:20:40,172 --> 00:20:47,346 So, he took 12 sailors with classical scurvy, divided into six groups of 2 each, 249 00:20:47,346 --> 00:20:52,918 and all were given identical diets and the various groups were supplemented 250 00:20:52,918 --> 00:20:57,522 with either vinegar; dilute sulfuric acid; cider; sea water; nutmeg, 251 00:20:57,522 --> 00:21:02,628 garlic, and horseradish mixture; or two oranges and one lemon daily. 252 00:21:03,462 --> 00:21:07,165 And here are the results of all his studies. 253 00:21:07,165 --> 00:21:12,537 The only thing that worked was citric fruit and it was not significant. 254 00:21:12,537 --> 00:21:16,642 But, of course, they didn't have statistics in those days. 255 00:21:18,810 --> 00:21:21,980 So, he wrote a paper, which 256 00:21:21,980 --> 00:21:27,853 is shown on this slide, and became famous because, based on 257 00:21:27,853 --> 00:21:34,793 these data, scurvy was prevented in the Navy by giving people citrus fruit.