I really love this site, it is obivous that the owner puts a lot of effort into this

Wow. I love being reminded of stuff like this. Those cars were so cool.

Edit: I took one of these cars apart as a kid to see how it worked. This site brought back a lot of memories. The little coil spring inside the gear. I have to get my hands on one of these now…

This really needs to be done for a GLP-1 auto injecting needle.

Pretty sure it’s the same as an epi-pen as well.

It blows my mind. It’s a disposable, single use device that at the press of button:

1. Inserts the needle in your skin, 2. Slowly presses the plunger until the dose is injected 3. Then retracts the needle with plunger

Three distinct and seemingly opposing motions. With timing. All in a little plastic enclosure. It sure I can think of a toy with that kind of mechanism.

Love this site! Well done!

What is the name for the sort of toy car you push in one direction and it continues slowly in that direction? These ones were usually styled as 4x4 vehicles and almost moved like a rock crawler with the 4wd set to low. They could be pushed forward or in reverse (and then would go in reverse).

I learned this when I was 4. We even had ones that shot sparks. America. The animations on this are really well done and I loved that trip back to childhood of pulling the car back and letting it rip. However, given the popularity, you should simulate what happens when you pull it back to the extremes over and over again and the spring gets stretched. It no longer kicks as fast as it used to and in some cases, it won't go at all.

If you have access to a 3D printer, this helps explain the basics too: https://www.thingiverse.com/thing:3308710

Please leave my browser history alone