Learn how GROUPBY passes both subset and full arrays into LAMBDA in Excel, letting you compute percent shares fast and explain results clearly.

Excel still trips over dates, ghost links, and undo history. These six fixes would save hours for everyday users.

Diarmuid Early won first place in the 2025 Microsoft Excel World Championship. He has some pointers for using Excel at work.

In a quest for a truly minimal computer, that can be built from readily available 74HC components on a low cost pcb, I have settled on a novel 8-bit, bit-serial architecture - a design that I call ...