The proof, known to be so hard that a mathematician once offered 10 martinis to whoever could figure it out, uses number ...

Plus: What’s open at the IRS, the fight over premium tax credits, guidance on OBBBA, Social Security increases, digital taxes and tariffs, Section 179 expenses and more.

The Notes app on iOS 26 gets an update that lets you create 3D graphs from functions you enter without needing another app or doing too much work.

We tested ereaders from Kobo, Amazon, Boox and more to see which one is the best overall, along with a budget pick and the ...