If someone normally burns in 10 minutes with no sunscreen, then a sunscreen with sun protection factor 20 will provide protection for up to 20x10 = 200 minutes
The British species of Utricularia which produce 'earthshoots' never show the second form of modification, the 'airshoot' ( L in Fig. 65, p . 98), which occurs only in U. vulgaris and in the closely allied U. neglecta.
The package was addressed to someone we didn't know, so we returned it to the sender.
They are unanimously shy of Ade in their horn-books for sophomores, and they are gingery in their praise of him in their innumerable review articles.
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