A tutorial which explains what moles are and why they are important. Learn how to abbreviate the mole number (Avogadro's number) using scientific notation, and how giant this number is. [10:50]

Tony Denning of Maple Leaf Farm in Canterbury started making maple syrup after he was laid off from his construction job three years ago. The sugarhouse is now a modern maple-producing operation using miles of plastic tubing, a vacuum...