### How many different smells can your nose remember?

Your nose can smell at least 1 trillion scents. Scientists had long assumed our noses could distinguish about 10,000 odors. (TIME.com) — Human beings tend to think of themselves as visual first, auditory second, then touch and taste.

The largest denomination of currency ever printed by the Bureau of Engraving and Printing (BEP) was the \$100,000 Series 1934 Gold Certificate featuring the portrait of President Wilson.

The speed of light in a vacuum is 186,282 miles per second (299,792 kilometers per second), and in theory nothing can travel faster than light. In miles per hour, light speed is, well, a lot: about 670,616,629 mph. If you could travel at the speed of light, you could go around the Earth 7.5 times in one second.

Opossums are not rodents. They are an order unto themselves, part of the “infraclass” known as marsupials. The label distinguishes marsupials from placental mammals, such as rodents.

In central London, trains cannot drive faster than 30-40mph because of the short distances between stations. The Victoria line can reach speeds of up to 50mph because the stations are further apart. The Metropolitan line has the fastest train speeds, sometimes reaching over 60mph.

Monica is the younger sister of Ross Geller (David Schwimmer). She is best friends with Rachel Green (Jennifer Aniston), Phoebe Buffay (Lisa Kudrow), Joey Tribbiani (Matt LeBlanc), and Ross’s college roommate and best friend, Chandler Bing (Matthew Perry).

The Moon appears to change shape because we see different amounts of the lit part as the Moon orbits Earth. When the Moon is between Earth and the Sun, the lit side is hidden from us. As it moves around Earth, more and more of the lit side comes into view.

She’ll learn to sit, roll over, and crawl before moving on to pulling up and standing at about 9 months. From then on, it’s a matter of gaining confidence and balance. Most babies take their first steps sometime between 9 and 12 months and are walking well by the time they’re 14 or 15 months old.