Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
Did you know?
The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
Did you know?
The longest a person has survived after a heart transplant is 24 years.
Did you know?
The familiar sounds of your heart are made by the heart's valves as they open and close.
Did you know?
Critical care patients are twice as likely to receive the wrong medication. Of these errors, 20% are life-threatening, and 42% require additional life-sustaining treatments.
Carpilius convexus consuming Heterocentrotus trigonarius in Hawaii
All Muslims must face Mecca, Saudi Arabia, to pray. Here, the minaret of a mosque is aligned with Me
Consuming Lithosphere at Convergent Plate Boundaries
Among non-Muslims in the United States, wearing a head scarf, or a khimar, is a personal fashion ...
Assumptions of race-ethnicity can have unusual consequences. In this photo, Ethiopian Jews in ...