1 E14 S

• Shorter times
• 3.74 million years -- half-life of manganese-53
• 4 million years -- estimated average lifetime of biological species
• 4 million years -- time since beginning of last ice age
• 4.2 million years -- half-life of technetium-98
• 5 million years -- time since beginning of Pliocene Epoch
• 5 million years -- time since end of Miocene
• 6.5 million years -- half-life of palladium-107
• 15.6 million years -- half-life of curium-247
• 20 million years -- time since the first forms of grass appeared
• 23.42 million years -- half-life of uranium-236
• 24 million years -- time since beginning of Miocene Epoch
• 24 million years -- time since end of Oligocene Epoch
• Longer times

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