History's Most Dangerous Aircraft Models

The More You Know

• A Nepalese doctor has restored the sight of over 100,000 often poverty-stricken people in the last thirty years across Asia and Africa using a 5 minute procedure and an inexpensive artificial lens.
• Glaciers and ice sheets hold about 69 percent of the world's freshwater.
• The hashtag symbol is technically called an octothorpe.
• It's a tradition in Ireland that if you donated a pint of blood, they give you a pint of Guinness to replace the iron.