|
|
Dogs have been used in studies to detect various cancers in human subjects. They have been trained to sniff breath samples from humans that were collected by having them breathe into special tubes. These people included 55 lung cancer patients, 31 breast cancer patients, and 83 cancer-free patients. The dogs detected 54 of the 55 lung cancer patients as having cancer, detected 28 of the 31 breast cancer patients, and gave only three false-positive results (detecting cancer in people who didn't have it).
Interferon was scarce and expensive until 1980, when the interferon gene was inserted into bacteria using recombinant DNA technology, allowing for mass cultivation and purification from bacterial cultures.
The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
The horizontal fraction bar was introduced by the Arabs.
Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
![Devil facial tumour disease causes tumours to form in and around the mouth, interfering with feeding](https://biology-forums.com/gallery/47/medium_27692_23_04_12_4_18_04.png)
![Bonobo females form close alliances, maintained through sex, but these alliances are lacking in chim](https://biology-forums.com/gallery/47/medium_269691_26_01_15_5_55_54_204501800.jpeg)