Shimano 105 RD-5501 9 Speed Rear Derailleur GS Road Bike Folding Bike RD-5600 xsbwkn868-Derailleurs (Rear)

KNOCK  Mother bees have to do their own hunting for pollen and nectar in the Ceratina nigrolabiata species, but a male bee (shown) eager to mate with her will watch her young while she’s gone.

BLASTS FROM THE PAST  Swift, powerful bursts of charged particles emitted by the sun can be strong enough to breach Earth’s magnetosphere (blue bubble in illustration). To see how common such emissions have been in Earth’s past, scientists look for telltale data in tree rings and ice cores. 

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