A pretty spectacular science experiment: how to make an Incredible Egg Geode. 

Your egg geode is formed through a process called sedimentation. The heated alum solution contains suspended particles of alum powder and as the solution cools, these particles of alum begin settling. When the alum particles settle towards the bottom of the beaker or glass, they begin crystallizing. With the alum-covered egg at the bottom, the alum particles from the solution begin attaching themselves to the egg. Covering your egg in alum powder beforehand gives the suspended alum particles a surface to which they can more readily attach themselves. The particles that settle onto the surface of the egg crystallize, and you will also see crystallization on the bottom and sides of the beaker or glass.

The very catchy Counting by Fives from Schoolhouse Rock!

2 pears, 1/2 cup Gorgonzola, 1/2 cup of butter, 1 baguette and some honey: Pear & Gorgonzola Crostinis

The Human Piano. (This also seems like a great DIY video project, yes?)

More than 300 random people on the streets of Israel, each repeating one single note, creating together one harmonious melody. No Auto-tune was used in the making of this video.

via @swissmiss.

This video demonstrates how to tie a Figure 8 knot, one of the Basic 8 knots that lead to a huge catalog of useful tying skills for boating, climbing, scouting, search and rescue, and more.

The Figure 8 is a stopper knot — it prevents the end of a rope sliding through a pulley or it can be used to add security to another knot. It is relatively easy to undo, is preferred to the Overhand Knot, but is not as secure as the Double Overhand.

These videos are from AnimatedKnots.com, where they believe that it’s “Better to know a knot and not need it, than need a knot and not know it.” And don’t forget, safety first!