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Struggling to understand a Biological Concept? Watch our growing library of Biology videos and you will see how easy it is to take a concept and make it fun. People all over the world have been using these videos to make their C's into A's. Check them out, and have fun learning.

Traditionally, science in the United States has been taught in isolated disciplines such as chemistry, biology and physics without clear connections being made between the subjects. The 8+1 effort encourages K-12 teachers to use the eight science concepts to build understanding within and between their courses as students advance through the grades.

Today's frontiers in science often occur at these disciplinary edges. Aided by the explosion in technology and scientific discoveries, new fields are arising that were hardly imagined a generation ago such as synthetic biology, digital organisms and genomics.

If you are going to spend time on science, though, please be wary of glib explanations that will confound a child's true understanding just a few years down the line. Language matters far more than facile explanations of the natural world. Unless you know what energy is, and I got to tell you that I do not, do not pretend a 7 year old can master this. Unless you can explain a concept accurately without using science jargon, do not pretend your lambs will get it. My students are amazed water comes out of flame, something easily demonstrated at any level of public education, yet accept that the Earth is round at face value, because you, the most powerful person in this child's life outside of family (and sadly occasionally including family), said so.

Turns out, biological sex determination in mice is kind of an ongoing battle. It doesn’t end during fetal development. It doesn’t even end at birth.

For now, the main thing we can take away from this discovery is a gentle reminder that our bodies really are weird and wonderful. Even if you’re already used to thinking about gender as a fluid concept, it can be strange to realize how flexible biological sex is, as well. Don’t get too hung up on the idea that “male” and “female” must be set-in-stone categories. Nature certainly doesn’t treat sex that way.