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Several other limits as well:

Extending to the 19th century and you'll find a few more limits to knowledge and capabilities.

1. Einstein, general reletivity, and the speed of light as an absolute limit.

2. Thermodynamics, and the limits imposed by entropy.

3. Rankine and Carnot expressing the limits of efficiency of heat engines.

4. Claude Shannon and the limits of information density over a communications channel.

5. Hubbel's expansion constant and the size of the observable Universe.

6. Moore and Wright with (empirically-derived) principles of production efficiencies.

7. M. King Hubbert, and limits to the total amount of petroleum in the US and world.

8. Meadows, et al, and the potential limits to human growth. Somewhat rough, but clearly finite.

9. Keeling and limits to atmospheric absorption of CO2 without producing significant climate change.

(Not all of these limits are fully accepted, though I've strong reasons to believe they're well founded.)

10. The Chandrasekhar limit (and also the TOV limit), you could argue this is a subset of the limits imposed by relativity, but I think it's interesting and important enough to warrant being listed separately.

Fair enough, though it's not one that's likely to be encountered in the course of everyday events (though I listed several of those myself).

I found the GP observation that the 20th c. had presented numerous limits to be a rather interesting point, and one not typically dwelled upon. The limits specific to human activities, technologies, and interests especially strike me as significant.

Very cool, thanks for the list

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