Why You Always Carry Spare Memory Cards

It seems like a silly enough statement: Why do you carry extra memory cards? Why do you leave some open space on the ones you have? Because you never know when a volcano is going to erupt.

No, really: Ingolfur Bruun writes on the Reuters photo blog that he came across an erupting volcano and only had seven frames left on his card.

I can’t wait to tell this story to my students next fall …

Mark E. Johnson

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