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April 15th is tax day in the United States.

It is also the birthday of Leonardo Da Vinci, three Nobel Prize winners and two other prominent scientists. Find out who they are and what else occurred on this day in science history.

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Unless you want to make Easter stink bombs, you won't want to color hard-boiled eggs today. Why not make Easter decorations by dyeing hollow eggs? To make colored hollow eggs, first you need uncooked eggs (you'll probably burst a blood vessel trying to empty a hard-boiled egg this way). Take a pin, sharp nail or awl, and work a hole into one end of the egg. Turn it over and repeat the process. Larger holes make it easier to remove the contents of the egg, but are also more obvious. Place the egg over a bowl, blow through one hole to force the contents out the other hole. Rinse off the egg and allow it to dry. Make scrambled eggs, if you like. Note: this can be a time-intensive process and is easier for an adult than a child.

Next, make dyes and color your eggs. The dyes are generally non-toxic and safe for kids to make and use, plus you can think about pigments (molecules that have color) and mordants (molecules that bind in a reaction to intensify color or make the dye more colorfast).

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