Andrew Huberman just explained why your brain won't focus — and it's not ADHD, it's sensory overload from the device in your hand. In this 4:52 clip he lays out Jenny Groh's breakthrough insight: Thoughts aren't random. They start with one tiny seed (a word, image, memory) and then explode into a cascade of layered sensory memories — sights, sounds, touches, smells — all piling on in an abstract space. The more sensory inputs you've taken in recently (especially through your phone), the more competing layers flood in when you try to concentrate. That's why you sit down to read/work and suddenly realize you weren't even paying attention — your brain is still processing the infinite novel stimuli it got 10–15 minutes earlier. Huberman's fix: Make yourself deliberately bored before deep work. Remove as much sensory input as possible (no phone, dim lights, quiet). He keeps an entire floor as a no-phone zone. In China they're experimenting with kids staring at a blank wall for minutes before tasks. Modern life has shrunk the physical space you can look at (staring at a screen), but flooded the cognitive space with endless distractions. Result: Focus becomes almost impossible. Mind blown? What's one thing you've noticed kills your focus the most — notifications, background noise, recent scrolling? And what's helped you clear the mental slate before deep work?