Yawning, a common reflex that lasts about 4-7 seconds, remains a mysterious phenomenon despite centuries of scientific inquiry. While theories abound, from brain temperature regulation to social bonding, researchers have yet to reach a consensus on the exact purpose of this involuntary action that begins in the womb and continues throughout our lives.

According to experts, cold weather alone doesn't directly cause illness, but it can increase the likelihood of getting sick. As reported by the American Heart Association, cold temperatures may allow viruses to survive and reproduce more easily, while also driving people indoors where infections can spread more readily in close quarters.

Hiccups occur when the diaphragm, a muscle between the lungs and stomach, involuntarily contracts, causing a sudden intake of air that is quickly stopped by the closure of the vocal cords. While the exact cause isn't always clear, common triggers include eating too quickly, carbonated beverages, and sudden excitement.