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• ## Why does multiplying two negatives give you a positive?0

I found myself in a difficult situation the other day:  explaining the multiplication of two negative numbers to my 8 year old. Negative numbers are rather simple to illustrate when using temperature because there is a clearly visible “zero” Celsius and numbers on either side of it.  Living in Canada, we can see dramatic fluctuations

• ## The “Infinite Profit” Puzzle0

Let’s say I put \$20 in a box. Now you do the same. The box now contains \$40, and we’re both aware of this fact. Now, I sell you the box for \$30. We both walk away with \$10 profit. Repeat forever, and you’ve got an infinite supply of money. Wait, wut? At first glance,

• ## Does 0.99999… really equal 1?3

Does 0.999 (repeated) equal “one”? You might be surprised by the answer… which is “yes“. I heard this on a couple of podcasts over the last few months, and I still find it hard to accept at face value. However, I am now convinced and here’s several simple proofs that .99999 does indeed equal 1…