An unnecessary problem
Scientists sometimes set themselves problems just to learn.
explanation
Alternate methods
The answer or the process?
When there’s more than one way to get there, you have to choose. This can be confusing or useful.
A village in space
How big is your village?
Thermodynamics is unfair
Photography: the hard part
Keeping track
It’s still the same task, digital or film. And it is still not done well, sometimes at all, by most photographers.
A cup of suns
Saving the phenomena
A near miss
Fixed stars, part I
A star is coming very close to the Sun very soon, as distance and time go in astronomy.