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August 8, 2017

The shortest time between two points is NOT a straight line

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From Curiosa Mathematica:

The Brachistochrone

This animation is about one of the most significant problems in the history of mathematics: the brachistochrone challenge.

If a ball is to roll down a ramp which connects two points, what must be the shape of the ramp’s curve be, such that the descent time is a minimum?

Intuition says that it should be a straight line. That would minimize the distance, but the minimum time happens when the ramp curve is the one shown: a cycloid.

Johann Bernoulli posed the problem to the mathematicians of Europe in 1696 and ultimately several found the solution.

However, a new branch of mathematics, calculus of variations, had to be invented to deal with such problems.

Today, calculus of variations is vital in quantum mechanics and other fields.

August 8, 2017 at 12:01 PM | Permalink | Comments (0)

"Paris By Night"

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Above, the English title of "Une Nuit," which I watched last night.

Really good, especially for those of us who get our foreign travel kicks in two dimensions.

Kicker of an ending, too — caught me completely by surprise.

What's with the 10:01 a.m. post, joe? 

Could become a fixture or might be a one-off. 

Not even Gray Cat knows, and that's saying something.

August 8, 2017 at 10:01 AM | Permalink | Comments (0)

Unicorn Nail Dryer

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How do you spell kawaii?

From the website:

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Allow our super cute Unicorn Nail Dryer to blow a gentle stream of air onto your nails whilst adding some personality to your dressing table.

So easy to use: simply place wet nail on the "magic" star and let the unicorn do the rest.

The nail dryer requires 2 x AAA batteries (not included) rather than Unicorn magic, unfortunately!

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$11.99.

August 8, 2017 at 08:01 AM | Permalink | Comments (0)

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