According to a study by kelly et al. (1999), naval personnel on submarines were asked to function on 18-hour "shifts": 6 hours of work, 6 hours of recreation, and 6 hours of sleep. what happened to their circadian rhythms?

stewards ice box was the purchase of alaska from russia and it was called that because people thought it was not a good idea to purchase alaska

imperial crisis leads to civil war.

roman forces withdraw from britain as goths attack rome.

odoacer topples romulus augustus

huns attack the empire and drive german peoples ahead of them.

answer; have joints that fail from excess by early the accumulated effects of unnoticed infections,all of these things are possible for a person born without the ability to feel pain;