Yellow Stained Glass turns into Locked Chest when relogging

Double buildings in superflat, and half buildings on top of some buildings without nearby abandoned mineshaft: How do you upload pics on mac?

You are apparently 1 block tall in FOV when you enter a minecart ontop of a diagonal rail

When a sticky piston with redstone block under pushes curved rail with redstone torch it will push but the torch will pop and the rail will stay.