We can make clocks that keep accurate time for millions of years. We can also make clocks with such high resolution they tick one billion billion times per second. So why can't we make a clock that does both?

Derivatives are about slope, and integration is about area. These ideas seem completely different, so why are they inverses?

Derivatives are about slope, and integration is about area. These ideas seem completely different, so why are they inverses?

How one of the introductory ideas in a field called "measure theory" can be thought of in terms of musical harnomy and dissonance.

At TED in 1998, Brenda Laurel asks: Why are all the top-selling videogames aimed at little boys? She spent two years researching the world of girls (and shares amazing interviews and photos) to create a game that girls would love.

How one of the introductory ideas in a field called "measure theory" can be thought of in terms of musical harnomy and dissonance.

The city has just opened its one-of-a-kind Faberge Egg Museum, with a single egg displayed on each floor of a 100-story building -- and the world's most notorious jewel thief already has her eyes on the prize. Can you help the thief...

What happens when you multiply shapes?

Derivatives are about slope, and integration is about area. These ideas seem completely different, so why are they inverses?

Today we’re going to talk about confidence intervals. Confidence intervals allow us to quantify our uncertainty, by allowing us to define a range of values for our predictions and assigning a likelihood that something falls within that...

You might have felt the time passes more quickly as you get older, but why we feel like that?

What happens if you multiply things that aren't numbers? And what happens if that multiplication is not associative?

A video entitled "Represent with Histogram" covering the process of constructing a histogram by hand.

Howcast - Learn how to understand intervals on the bass guitar from musician John Sutton in this online guitar lesson from Howcast.

Howcast - Learn the difference between circuit training and interval training from certified personal trainer Max Tapper in this Howcast gym workout video.

Howcast - Learn what Seasonale is in this Howcast video about birth control.

Howcast - Learn how to play melodies using intervals on country guitar from musician Boo Reiners in this Howcast video.

Howcast - Learn how to play sixths on country guitar from musician Boo Reiners in this Howcast video.

Howcast - Learn which cameras are best for portrait photography from professional photographer Joe Sinnott in this Howcast photography tutorial.

Shave precious seconds off your running time and you just might win your next 5K.

Pupil outcome: I can use knowledge of decimal place value to solve problems in different contexts. Key learning points: - Knowledge of decimal place value can help to read the scale of a graph. - Knowledge of decimal place value can help...

Pupil outcome: I can solve problems involving writing, telling and converting the time. Key learning points: - Times tables help us to convert between units of time. - There are 60 minutes in an hour. - There are 60 seconds in a minute.

Pupil outcome: I can compare and sequence intervals of time. Key learning points: - Intervals of time can be compared using greater than, equal to and less than. - They can also be ordered from longest to shortest or shortest to longest.

Pupil outcome: I can estimate and compare the duration of events and tasks Key learning points: - Estimating and comparing can be used when considering how long different activities might take. - Adding and subtracting skills might be...