When babies crawl, their movement across floors, especially carpeted surfaces, kicks up high levels of dirt, skin cells, bacteria, pollen, and fungal spores, a new study has found. The infants inhale a dose of bio bits in their lungs that is four times (per kilogram of body mass) what an adult would breathe walking across the same floor.  

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Light is an important cue for nearly all life on Earth. Plants use light for photosynthesis, animals use light to set sleep cycles, and marine organisms use light to find food, avoid predators and even hide in plain sight.

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