Hotting up
| D | I | R | T | Y | C | H | I | M | N | E | Y |
| B | Y | G | O | N | E | E | U | R | O | P | E |
| B | A | S | I | L | W | I | L | H | E | L | M |
| E | A | T | P | E | B | B | L | E | N | U | T |
| N | E | V | E | R | S | A | Y | F | I | R | E |
| I | D | L | E | B | O | N | E | N | I | N | E |
| R | E | S | P | O | N | S | E | T | I | M | E |
| O | P | E | N | A | P | H | I | D | W | A | R |
| U | T | M | O | S | T | B | O | U | N | C | E |
| L | E | A | G | U | E | I | C | E | M | A | N |
| F | L | O | R | I | D | C | H | E | E | K | S |
| N | O | D | A | R | T | S | T | O | D | A | Y |
The eight elements are highlighted in colour above. They are: iodine, neon, fluorine, radon, argon, ruthenium, erbium, dysprosium.
The initial letters spell INFRARED, which is a type of electromagnetic radiation that we cannot see but which we can detect as heat. It is also the basis for night vision devices.