ANN ARBOR, MI — They seem to mysteriously proliferate along neighborhood sidewalks throughout Ann Arbor. The many rigid metal holes across the city have perplexed residents. Some get fixed, then ...

Even damaging the surfaces didn’t make them sink – the team drilled six holes in them measuring 3 mm, and one measuring 6 mm, and the structures stayed afloat. Apparently, enough air remains ...

Most twist bits are available in sizes up to 1 in. in diameter, but you’ll get the best results by starting with a 1/4-in.

Some Russian units in Ukraine are disciplining troops by putting them in dirt pits, per the UK MOD. The holes in the ground are covered by metal grilles, and are makeshift dungeons called "zindans." ...

Once each hole was fully tacked in place with four welds each, we went back to add more tacks around each plug’s perimeter. Remember to keep the heat down; if the metal warps a tiny bit, you can ...