Posts by Toby Speight
Polarization alone makes no difference to UV protection where it most matters: the interior of your eyes, especially your retinas and vitreous humor. Although the polarized glass blocks a proporti...
My experience relates to Common Dolphin, but likely applies to dolphins of other species, too. Although dolphin may be seen at any time, you are most likely to see them in proximity to food. So i...
It's impossible to say from a photograph whether something is "safe" or not. Many factors come into play, including the experience level of the climbers concerned. For all we know, they may have ...
If you get a pair, you can choose whether to actually use one or both for a particular day. I recommend that you buy a pair well before your expedition, and use them enough to you learn your prefe...
As always with such general questions, "It depends". In a lightning storm, you should always get well clear of any trees. The reason for this isn't that trees are necessarily the most likely plac...
I was inspired by the question "What should one do when climbing if someone above you yells ROCK?" to ask what the equivalents are around the world. So, what would I shout to warn someone below me...
North America English Canada / United States "ROCK!" (pronounced /rɒk/) French Canada "ROCHE!" (pronounced /ʁɔʃ/) Europe European Alps "CAILLOU !" (pronounced /ka.ju/) It's Fr...
Your signal mirror is likely polished on both sides, with a hole in the middle to help you aim it. Although the principle is simple, it's fiddly and takes a little practice. With the mirror in ro...
Imagine for a minute that the Earth is perfectly spherical, that sunlight arrives "from infinity", and that any given spot is either lit or unlit. Then, at any given time, exactly half the surface...
Breathing is the largest single source of moisture in a tent, followed by cooking. A common mistake is to close the tent completely, without providing ventilation to (sufficiently) carry your mois...
In 2003, the International Maritime Organisation stated in 2003 that fewer than 1 in 20 alerts related to persons genuinely in distress: 1.4 False alerts in the IAMSAR Manual are defined as: A...
Cave photographers have to deal with a similar problem, where thin steam that's normally invisible can be seen in photographs taken with flash. Steam is composed of fairly spherical droplets of wa...
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