What are life’s 7 magic numbers?

• Staying in touch every two weeks is what keeps friendships alive.

• 5 good things for every 1 bad things is the golden ratio for harmonious relationships.

• Yes, we are more likely to buy when the price is $1.99 instead of $2.00.

• Recounting three good things every day is the key to increased happiness.

• 0.7 is the female waist-to-hip ratio men find most attractive around the world.

• 10,000 hours is how long it takes to be an expert — if you challenge yourself every day.

• The effects of money on happiness flatten out at $75,000 a year.

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