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The Expanding Universe

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Question: A girl runs at 8 km/h from her home to a shop, and then runs back home at 6 km/h (carrying a bag). What is her average speed and average velocity?

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Subject of the Week


'Universe' on covers astronomy, cosmology, and space exploration. Learn Science with


Great Scientists

Theodor Schwann

1810 - 1882

Theodor Schwann was a German scientist who had a profound impact on biology by breaking with entrenched concepts prevalent in the mid 19th century.

Theodor Schwann

Quote of the day...

"Now, I am afraid my usefulness has ended."
"Maestro Galileo, don't be like that. I promise you you will go down in history."
"That's what my teacher told me. If you don't study harder, he said, you will go down in history."

A Term a Day:

Natural Log

[ Mathematics : Numbers and Geometry]

e is the base for the natural logarithm, and is very approximately e = 2.71828 18284 59045 23536 02874 71352 66249 77572 47093 69995 95749 66967 62772 40766 30353 54759 45713 82178 52516 64274 27466 39193 20030 59921 81741 35966 29043 57290 03342 95260 59563 07381 32328 62794 34907 63233 82988 07531 95251 019...

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