Come on, says Dr. Steve. It’s Trump’s pointless ego-driven war and his general blend of incompetence, malice and delusions.

Need help filling out your bracket? Look to history for how many upsets to pick and which seeds are usually the most vulnerable.

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Yet swarms of fireflies clearly exercise a level of control over when they light up, and they do so only in specialized organs, and those are aspects scientists are still keen to understand better.