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School subscriptions can access more than 175 downloadable unit bundles in our store for free (a value of $1,500).
District subscriptions provide huge group discounts for their schools. Email for a quote: sheri@exploringnature.org.
Ultraviolet light is a kind of electromagnetic radiation from the sun that has a wavelength shorter than visible light, so we cannot see it. Though too much ultraviolet light is bad for us, we do need some to be healthy for helping the body use Vitamin D.
