1 of 1
Story summary
- The July 20, 2026 online puzzle concludes that only about one-third of the Sun’s energy reaches the room despite two window layers.
- Its solution states the blinds radiate twice as much energy as the curtains, giving a 33 percent transmission rate.
- The author notes the problem assumes homogeneous materials, equilibrium, and ignores glass, colour and room shape, and is part of a series posted on alternate Mondays since 2015.
