Dr Karl Podcast Frozen vs fresh veggies, soap suds and nangs
Nov 13, 2025
Ever pondered if an invisible person would be blind? Dr Karl dives into the science of light scattering! Learn why ice cubes can develop surprising spikes and how frozen vegetables can often be just as nutritious as fresh ones. Discover the mysteries of pain tolerance, bees making honey, and the effects of nitrous oxide on vitamin B12. Plus, Dr Karl debunks fears about un-rinsed dish soap. Wrap it all up with tips on staying cool in extreme heat!
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Nitrous Use Harms B12 And Nerves
- Avoid heavy recreational nitrous use; repeated exposure irreversibly deactivates vitamin B12 and damages nerves.
- Seek medical advice and increase B12 intake if you've used large amounts or feel numbness or weakness.
Why Ice Cubes Grow Spikes
- Ice spike formation happens when outer water freezes first and expanding ice ejects liquid through a hole that then freezes into a spike.
- Poor freezer seals or placement near airflow increase the chance of these stalagmite-like spikes forming.
Visibility Needs Visible Eyes To See
- If someone were invisible, make their eyeballs visible or opaque; otherwise incoming light from all directions would flood rods and cones and prevent sight.
- Design thought experiments to consider sensory side-effects of hypothetical abilities.
