Clean tech is invading the kitchen as well -- behold the Biobot, a tabletop device that converts waste cooking oil into biodiesel.

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Cooking is therapy for Estrada and the kitchen - a spotlessly clean room with all the modern trimmings - is his inner sanctum.

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Nor do they want to clean up the kids' messes or spend all their time in the kitchen, I'm told.

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Grit can get trapped in the mushrooms' nooks and crannies, so give them a swish in a bowl of cold water, then repeat with fresh water until the water runs clean and let them air dry in a single layer on kitchen towels.

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In the most concentrated areas, he says, it could be compared to products you would clean your kitchen with, causing dry or cracked skin, or - in cases of prolonged contact - it can "lift off the top layer of your skin".

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