Activity for William‭

Type	On...	Excerpt	Status	Date
Answer	—	A: Affordable Hiking/Trekking boots for flat feet Ultimately, it comes down to personal preference. There are many people with "large, wide, and flat feet", and every one of them has a different idea of what "comfortable" means to them. For example, some people like heavily insulated shoes, while others hate it. Thus, while materials and constructio... (more)	—	almost 9 years ago
Answer	—	A: How are textile properties, such as elasticity, wind and water resistance, drying time, measured? Actually, there is an international standard for waterproof-ness of textiles, but it's only used in factories for QA. ISO 15496:2004 involves measuring the "water vapour permeability of textiles". IIRC, there's no number for classification that you can use to compare and contrast products, but some ... (more)	—	about 9 years ago
Answer	—	A: How many people have done a triple triple? As far as anyone knows, no one has done a triple hike of each of the Triple Crown of Hiking. That said ... None of the three trail conservatories keep very rigorous records; instead they make estimates of trail usage based on trail registers and permit applications. Someone can do the full PCT and ... (more)	—	about 9 years ago
Answer	—	A: What micron level is needed to properly filter viruses from water? Let's look at the absolute here. The hepatitis B virus is 0.042 microns in length; this is about as small as viruses get (http://www.who.int/csr/disease/hepatitis/whocdscsrlyo20022/en/index2.html). This is the standard for "small". The smallest virus known to cause disease in humans is Parvovirus B1... (more)	—	about 9 years ago