Caffeine: The Silent Killer of Success:
Especially interesting is that caffeine has a half life of 6 hours - so your lunch time coffee is 25% still active after 12 hours.
Further facts from Wikipedia:
1 Decaffeinated drinks contain typically 1–2% of the original caffeine content, and sometimes as much as 20%.
2 A generally accepted statistic is that a cup of normal black (often called red in China; as distinct from green) tea contains 40–50 mg of caffeine, roughly half the content of a cup of coffee.
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