'Another group of mathematicians is working to put an upper bound on the number, although everyone keeps begging them to stop.'

3138. "Dimensional Lumber Tape Measure"

'A person with two watches is never sure what time it is, especially if I got them one of the watches.'

3139. "Chess Variant"

'The draw-by-repetition rule does a good job of keeping players from sliding a tile back and forth repeatedly, but the tiles definitely introduce some weird en passant and castling edge cases.'

3140. "Biology Department"

'Welcome to the Linguistics Department - It has been [2] [DAYS] since someone noticed that the Biology Department sign has a one-day-long singular/plural disagreement after it resets.'

3141. "Mantle Model"

'Mantle plumes explain Hawaii, Yellowstone, Iceland, the East African Rift, the Adirondack uplift, the Permian extinction, the decline of Rome, the DB Cooper hijacking, and the balrog in Moria. Those little hills of sand in your yard are caused by antle plumes.'

3142. "<City>-Style Pizza"

'If you want to see true audacity, do an image search for 'Altoona-style pizza.''

3143. "Question Mark"

'Although now people will realize three-per-em space that all this time I've been using weird medium mathematical space whitespace characters in my hair space hair space hair space speech dot dot dot...'