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Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).
Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
Chronic marijuana use can damage the white blood cells and reduce the immune system's ability to respond to disease by as much as 40%. Without a strong immune system, the body is vulnerable to all kinds of degenerative and infectious diseases.
When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.
![Compression ratio is the ratio of the total cylinder volume (when the piston is at the bottom of ...](https://biology-forums.com/gallery/29/medium_548020_25_05_17_1_02_51_293272431.png)
![Record the first puff and this final reading for each cylinder. The final readings should all be ...](https://biology-forums.com/gallery/29/medium_548020_30_05_17_4_21_59_29705450.png)