ELI5

Do you find 12-hour or 24-hour time easier?

I like that 18:30 cannot be confused with breakfast time, but I still say half past six out loud. Which clock format feels most natural to you?

How can a phone offer emergency calls without normal service?

The screen says there is no ordinary mobile service, but emergency calls may still be offered. What does that message actually mean, and what network connection is still needed?

Can one infinity really be bigger than another?

There are infinitely many numbers between zero and one, and between zero and two. How should we compare those sets without assuming that a longer interval automatically contains more members?

Why can a phone cost as much as a laptop?

A small screen does not necessarily mean a small price. What are the main reasons smartphones and laptops can land in similar price ranges? Explain it without assuming hardware knowledge.

Why do we sometimes miss a repeated word?

Read quickly and your brain may glide over a word that appears twice. What is happening when the meaning we expect takes priority over the exact text on the page?