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speakeron

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speakeron
·5 месяцев назад·discuss
The temperature of the cosmic microwave background can be used as a universal clock.
speakeron
·в прошлом году·discuss
It's actually Act 2, Scene 1 and is spoken by Polonius.
speakeron
·в прошлом году·discuss
Oblate spheroids are round.
speakeron
·в прошлом году·discuss
> Heathrow is massive and uses a lot of power (1-2MWh/day)

It's 3 orders of magnitude more: 1-2GWh/day.

https://www.heathrow.com/content/dam/heathrow/web/common/doc...
speakeron
·2 года назад·discuss
Just one ^n. Supermassive black holes are expected to have completely evaporated by 10^100 years.
speakeron
·2 года назад·discuss
It's not really whether it makes scientific sense or not, it's just that it's so very highly improbable (really, really improbable) that other explanations make more sense: the video's a fake, it's mass hysteria, or even that we're living in a simulation.
speakeron
·2 года назад·discuss
The use of a space as a thousands separator has been around since the 1940s as recommended by the International Bureau of Weights and Measures and it was what we used when I was a kid at school in the UK. They specified it should be a thin (half) space.

https://www.bipm.org/documents/20126/28433818/working-docume...
speakeron
·7 лет назад·discuss
Hambini has a good article on this[1]. The basic problem (apart from cost) is that only the ball bearing itself is ceramic; the inner and outer races are made of steel and the ball wears a groove into them which increases friction over time. Near the bottom of the article there's a 'power consumption vs kilometres' chart which illustrates this nicely.

"Hybrid ceramic bearings are the equivalent of trying to run a locomotive on an asphalt road - the hardness differential causes the road (raceway) to become damaged."

[1] https://www.hambini.com/blog/post/ceramic-bearings-vs-steel-...