Fixing cracks in concrete can be a real pain, but thanks to scientists in the Netherlands, lead by Henk Jonkers, that will be a thing of the past. The team has created a bio-concrete blend with water-activated bacteria - kept in tiny pellets - that can patch up small cracks and holes in cement. That's right, the bacteria would eat food provided in the concrete mixture to combine calcium with oxygen and carbon dioxide to form limestone. Click here to view the first image in today's viral picture gallery. Continue reading for the five most popular viral videos today, including one showing what really happens when a dam needs to release flood water.