Birthday body facts

Many of you liked this post a short while ago. Now there's more. This time from Unravelling the Spiritual Mystique

• Thinking about your muscles can make you stronger.
• Women blink twice as many times as men do.
• Intelligent people have more zinc and copper in their hair.
• We are about 1 cm taller in the morning than in the evening. Layers of cartilage in the joints gets compressed during the day.
• There are approx. 550 hairs in the eyebrow.
• The strongest muscle in the human body is the tongue.
• The hardest bone in the human body is the jawbone.
• The life span of a taste bud is 10 days.
• The world's youngest parents were 8 and 9 and lived in China in 1910.
• Babies are born without kneecaps. They appear when the child is 2-6 years of age.
• Your body is creating and killing 15 million red blood cells per second.
• Humans were first infected with the HIV virus in the 1930s.
• The force of 1 billion people jumping at the same time is equal to 500 tons of TNT.
• A baby is born every seven seconds.
• You breathe about 10 million times a year.
• The colder the room you sleep in, the better the chances are that you'll have a bad dream.
• The fastest growing nail is on the middle finger.
• The human body weighs 40 times more than the brain.
• After eating too much, your hearing is less sharp.
• There are more people alive today than have ever died.
• The human body is better suited to two four-hour sleep cycles than one eight-hour one.
• A man's beard contains between 7000 and 15,000 hairs.
• A beard grows an average of 140mm a year
• During an average lifetime, a man will spend 3,350 hours removing 8.4 meters of stubble

Thanks also to Crushed for the link