• Our atmosphere protects us from a lot of the small and medium impacts by burning them up. Other celestial objects have either no atmosphere to do this (moon) or a very thin atmosphere that doesn't burn them up before impact (mars), or the wrong composition of atmosphere.

• Often they don't have a climate to weather the impact craters that were made.

• our moon acts like a giant magnet or deflector shield orbiting our planet and scoops up a lot of the objects that might otherwise have hit us.

• the gravity of some of the bigger planets (Jupiter, Saturn) actually helps to deflect some of the more energetic objects coming from outside our solar system

• the old impact craters are there, but they are ancient and our planet's life has covered them with vegetation and millenia of human activity.

• and lastly, we've been very very very lucky in the last few hundred years. Nothing major has got through that obstacle course. But in recorded human history there have been a few biggies get through. Ancient records describe them, and even as recently as during the explorer days we've had records of asteroids coming in over some remote island or oceans.

Looks like a time-travelling Janelle Monae

Black Friday shenanigans

Yeah...but a mechanical device exposed to moisture tends to keep working.

Same thing with an electronic design will be way more sensitive and prone to failure.

If I had to choose between a mechanical and electronic device that achieves the exact same task without losing out on any functions, I'd rather have the mechanical version.

Also, the amount of electronics on Tue new ones...Sheesh.

I remember talking to an appliance repair guy years ago, who said it as basically as possible: circuit boards and water don't mix.