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Elisabeth DeWald

I've been a public school teacher for 26 years. My major was history, but along the way, picked up minors in math, biology, zoology, and other life sciences. My whole life has been on one side of the desk or the other. Husband and Dad were both MDs so science and medicine was a natural for me. My dad once told me that I knew more medicine than most doctors. I can easily answer almost any life science question, most history questions, and lots of medical questions.

Dana Krempels

I can answer questions about evolutionary mechanisms and theory, including genetic drift, mutation, natural selection, etc. I also can clear up misconceptions about evolution as it's sometimes talked about by those not well-versed in the subject (e.g., some politicians and many religious fundamentalists).

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2016-12-01 Help:

All cells have cell membranes, and the membranes are flexible.     So animal cells can have various shapes, but plant cells only have the shapes of their cell walls.     That's nice for plants, because

2016-09-27 Evolution of sex difference:

I'm not sure anyone knows the answer to that...whether it is a 'Nature' or 'Nurture' problem    Someone can look very masculine, yet be uncomfortable as a male.  There are at least two of us in the evolution

2016-09-19 Evolution:

Dear Adam,    All squirrel species descended from a common ancestor that had the characteristics that all squirrels now share in common.  However, as the ancestral squirrel population split off and migrated

2016-09-09 EVOLUTION:

Dear Adam,    This is actually not a simple question, because it requires that you have some knowledge of how evolution works in the first place.    There are many mechanisms by which an ancestral lineage

2016-09-08 EVOULOTION:

Dear Adam,    While we cannot go back in time to actually view the transition of single-celled organisms into multicellular ones, we can see evidence of such a change in the fossil record and in living

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