|
|
The strongest synthetic topical retinoid drug available, tazarotene, is used to treat sun-damaged skin, acne, and psoriasis.
It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.
Despite claims by manufacturers, the supplement known as Ginkgo biloba was shown in a study of more than 3,000 participants to be ineffective in reducing development of dementia and Alzheimer’s disease in older people.
The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
A good example of polar molecules can be understood when trying to make a cake. If water and oil are required, they will not mix together. If you put them into a measuring cup, the oil will rise to the top while the water remains on the bottom.
![Comparison of breast cancer and fibrocystic disease. (A) Breast with a malignant tumor growing in th](https://biology-forums.com/gallery/47/medium_14755_28_08_12_1_52_25_82592217.jpeg)
![Compressing the breast between plates provides a better image of breast tissue. Regular mammograms ...](https://biology-forums.com/gallery/47/medium_660366_13_03_17_1_49_42_26876412.jpeg)