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The Optimist Daily's Weekly Roundup

Jul 31, 2026

Dolphins fatally swim into fishing nets because the nylon is acoustically too similar to water for their echolocation to pick up. A researcher at Newcastle University wondered if attaching something that does produce an echo might change that. The dolphin-saving solution may surprise you.

Ten solutions this week with...


Jul 24, 2026

Watching a tense soccer match nearly doubles cardiac event risk, and cortisol could start rising fourteen hours before kickoff. With Spain just taking the World Cup, a fair portion of the world’s population has basically been running a biological experiment on itself.

Arielle and Karissa also get into the neurological...


Jul 17, 2026

Greece just launched the world’s first satellite constellation built specifically for wildfire detection. It can spot a fire measuring only a few feet across, a huge improvement on conventional satellites, which start flagging fires when they're already the size of a cruise ship.

Ten solutions this week with Arielle...


Jul 10, 2026

Every player at this year’s World Cup is wearing the end result of 500 years of iteration on a single piece of equipment. It started with factory workers hammering hardware store nails into their boots for traction on wet British turf.

Ten solutions this week with Arielle and Karissa: the world’s first exome therapy...


Jul 2, 2026

Stanford researchers took cartilage from patients already getting knee replacements (about as degraded as joint tissue gets) and discovered how it could regenerate itself. The cells weren’t replaced or reprogrammed; they just shifted back toward a younger pattern of behavior, which is the part that feels almost too...