- labour
1 22 division of
- La géometrie 19
- Lagrange 21 24
21 on board of measurement
- Lagrangian method 21
- Lamarck 25
25 on evolution
- Lamarckism 25 34
- language
15 Chinese
28 Hopi
- Lao-tzu 15
- Laplace 21 33
21 on board of measurement
21 Senator
- latent heat 21
- Laurasia 31
- Lavoisier 21 24
- and social revolution 24
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- learning (trial and error) 30
- Leibniz 20 20 32
- Lemaître 33
- Lenin 29
- Li Shi-Chen 15
- libraries
10 in Alexandria
16 in Arab (Islamic) civilization
16 in Cairo
- Liebknecht 29
- life insurance 32
- light
27 28 speed of -
27 28 duality wave/particle
- Lincoln 26
- linguistics 28
- Linnaeus 25
25 Systema Naturae
- Locke 22 35
- logarithms
32 in Europe
6 in ancient India
- Lokayata philosophy 14
- Lomborg 35
- Lomonosov 23
- longitude
17 determination of -
- Lorentz 28
- Louis XIV 20 21
- Luddites 27
- luminosity 33
- Lumumba 29 35
- Luther 19
- Luxemburg 29
- Lyceum, Aristotle's 8
- Lyell 31
- Lysenko 34
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