The stereotypical modern playground — with its bright colors and rubberized flooring — is designed to be clean, safe, and lawsuit-proof. But that isn't necessarily the best design for kids. US playground... continue reading

posted by BSR 4 months 1 week ago • 106 views • 5:44

A recent study had a lot of negative things to say about diet sodas, but how seriously should we take that study? Observational research can be powerful and useful, but it can also lead to shaky outcomes.... continue reading

posted by eric3579 8 months 4 weeks ago • 505 views • 6:17

YouTube description: While steel reinforcement solves one of concrete’s greatest limitations, it creates an entirely new problem: Corrosion of embedded steel rebar is the most common form of concrete... continue reading

posted by Aard Vark (oritteropo) 2 years ago • 248 views • 7:49

YouTube description: The Galton Board is a 7.5” by 4.5” desktop probability machine. This device brings to life the statistical concept of normal distribution. As you rotate the Galton Board... continue reading

posted by Aard Vark (oritteropo) 2 years 4 months 3 weeks ago • 801 views • 3:23

The Secret Service can no longer afford to pay hundreds of agents it needs to carry out an expanded protective mission. Federally mandated limits set by congress meant to pay the secret service for the... continue reading

posted by newtboy 3 years 1 month ago • 508 views • 1:13

YouTube description: When dancer David Chanishvili is on stage, he believes that he can fly. Indeed, he appears to glide through the air with ease while performing for the traditional Sukhishvili Georgian... continue reading

posted by Aard Vark (oritteropo) 3 years 1 month 3 weeks ago • 1,311 views • 2:33

Near Bodø in Norway, there's the strongest tidal current in the world: Saltstraumen Maelstrom, a constantly-changing rush of whirlpools, boils and vortices. It might not be quite the whirlpools of myth... continue reading

posted by Mordhaus 3 years 4 months 1 week ago • 237 views • 2:32

I never thought of sand as a non-renewable resource, but there's only a limited supply: and to make things worse, it keeps getting washed into the sea. At Cape May, New Jersey, the US Army Corps of Engineers... continue reading

posted by Mordhaus 3 years 7 months 2 weeks ago • 1,745 views • 3:22

One thing I should point out is that Mr. Manley consistently gets Karl Schwarzschild's name wrong. It's Schwarz Schild (black shield) and pronounced more like shield (except the d is a t sound and it's... continue reading

posted by Aard Vark (oritteropo) 3 years 9 months 2 weeks ago • 1,045 views • 8:00

In this video, we explore the helicopter speed limit, dissymmetry of lift, and what causes retreating blade stalls.

posted by Mordhaus 3 years 10 months ago • 708 views • 4:15

In Sanlúcar de Guadiana, in Spain, there's a zip line called Límite Zero: the only cross-border zip wire in the world, landing in Alcoutim, Portugal. You land about an hour before you set off.

posted by Mordhaus 3 years 11 months ago • 154 views • 2:03

YouTube description: It’s probably the most well known peacetime battle between the USA and the Soviet Union, in both technological and ideological terms of the 20th century. Although the USA won... continue reading

posted by Aard Vark (oritteropo) 4 years 1 month ago • 808 views • 14:23

As your country's top spy, you must infiltrate the headquarters of the evil syndicate, find the secret control panel, and deactivate their death ray. But your reconnaissance team is spotty, and you have... continue reading

posted by Mordhaus 4 years 3 months 1 week ago • 279 views • 4:01

In the far distant future humanity will only be able to see the galaxy which they are part of. Nothing more.

posted by eric3579 4 years 4 months 2 weeks ago • 1,600 views • 7:45