If the Earth is a sphere spinning once a day, every star should wheel around Polaris at fifteen degrees an hour. A phone on a tripod, shooting the night sky frame by frame, ought to be able to catch them doing exactly that.
16.5 ± 0.3°, against 16.5° predicted.
Can you show the Earth is a spinning sphere with a phone and a tripod? Assume it is, predict how the stars should wheel around Polaris, then go outside and check.
A bag of elbow macaroni seems to fill you up more than penne or farfalle. If that hunch is real, the elbows should simply weigh more once cooked from the same 500 g bag. So I cooked nine bags and weighed every one.
Elbows: about +200 g a bag. Hunch confirmed.
Do elbows really fill you up more than other pasta shapes? If so, a cooked bag should simply weigh more. Nine bags, three shapes, three brands, one kitchen scale.
The fastest way to cool a spoonful of soup — and whether stirring secretly warms it.
Blowing wins, 65 °C in 80 s, but it only chills the surface; stirring cools the whole bowl.
Cooling curves with exponential fits, plus a poll of 278 people.
ReadFeathers, iron, and a helium balloon walk onto a scale in open air.
In air they can't both read a kilo — buoyancy gets a vote. The helium balloon is the heavier one, and most people guess wrong.
No experiment needed; the experimental section is famously left to the reader.
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