Mark Zuckerberg on Taking Risks and Finding Talented People
And just to make this point, how far into Facebook did it actually become a company? Um, I don’t know. I think probably it
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View AllTelling time to the nearest minute: labeled clock | Math | 3rd grade | Khan Academy
Let’s look at this clock and see if we can tell what time is shown on it.
First thing, when we look at a clock, we have two hands, and that’s because time is told in two parts. Time is told in hours; that’s part, and on a clock, the hours are represented…
The Tenth Amendment | The National Constitution Center | US government and civics | Khan Academy
Hi, this is Kim from Khan Academy, and today I’m learning about the Tenth Amendment to the Constitution, the last amendment in the Bill of Rights. The Bill of Rights was added in order to calm some of the fears held by those who felt that the new, stronge…
There Are Better Ways to Save Sharks—Here's How | National Geographic
My name is Jess Graham, and I am a shark researcher and responsible marine conservationist. Lots of hammerhead sharks, frisky seals, huge yellowfin tuna, massive snapper—I’ve never seen anything like it! I’m studying the effectiveness of marine reserves o…
Diving With Bullsharks | World's Biggest Bullshark
Neil and James search a shipwreck for the mega shark, Big Bull, and other large bull sharks that may be her descendants.
“I’m good over here,” Neil says. Bull sharks have a pack-like mentality and swarm around possible food. They surround the divers.
Ne…
5 Things to Know About the Warming Arctic | Before the Flood
If you look at it from space, the top of the world, the white ice acts like a reflector, like a mirror that sends back sunlight and energy and heat back to space. That’s what made the Arctic the cooling system of the planet.
I was walking with Leo on the…
Inverse matrix introduction | Matrices | Precalculus | Khan Academy
We know that when we’re just multiplying regular numbers, we have the notion of a reciprocal. For example, if I were to take 2 and I were to multiply it by its reciprocal, it would be equal to 1. Or if I were to just take a, and a is not equal to 0, and I…