Infrared detectors

Isn't it more along the lines that for a given power dissipation in the device you can get something that is perceptually brighter with the right combination of frequency and mark space ratio for given a power. Most of them seem to use PWM brightness control now.

The eye registers movement or transitions locally as well as intensity. This is particularly noticeable when an LED traffic light is in your extreme peripheral vision if you rapidly shift your gaze towards it. You see a series of images of the flashing light source sometimes.

Walls filled with TVs also in peripheral vision can be annoying in the UK where cheap ones flash at 50Hz. 60Hz is better.

The points that at -40, you need a fire to survive for very long. You don't wait till night to look for firewood and start a fire.

Persuading the plane is easy. Persuading the pilot, not so easy;-)

From 1980-86 I made that trip often... both daughters graduated from Scripps' College for Women (Claremont)... actually #2 did her thesis at Harvey Mudd... she's the chemist.

It turned out that the plane was hangared just west of Blythe so, at least westbound, I could check whether it was on the ground or not... if I saw the plane I knew it could never catch up to me ;-) ...Jim Thompson

even

Seeing a soldering in serious dark ain't bad. Seeing a flat iron some

?-)