Monday  27 Nov 2017           comment?

Because Planck's constant is so small, it's easy to think of Heisenberg's uncertainty principle being relegated to phenomena occurring on too tiny a scale to observe in everyday experience. But there are noticeable effects that show the principle at work.

Photographers take diffraction into account when choosing lens aperture. The smallest aperture settings on most lenses don't give the sharpest pictures because of diffraction. This is an instance of the uncertainty principle: the more the iris confines the position of photons passing through a lens, the less predictable the photons' momentum. In particular, the direction of photons' momentum is uncertain and fewer of them go where you're trying to focus them.

Friday  24 Nov 2017           comment?

Pic from this morning.
Projective test: what do the clouds remind you of?
Mouseover the image for my answer.

Thursday  23 Nov 2017           comment?

Monday  20 Nov 2017           2 comments

Wednesday  08 Nov 2017           comment?

Wednesday  01 Nov 2017           comment?

The first garment care label I can remember seeing that includes the word exacerbate. Yes, I am easily amused.