Major funding for Rough Science was provided by the National Science Foundation. Corporate funding was provided by Subaru.

The most common kind of thermometer consists of a liquid, such as alcohol or mercury, in a very thin, hollow glass tube. It works because of the fact that liquids expand more than solids as their temperatures increase. If both the liquid and glass expanded equally, the whole thermometer would simply increase in size. Instead, what actually happens is that the liquid expands more than the glass and moves up the capillary, registering a change in temperature. Thermometers are usually calibrated with a certain range of temperatures in mind. For example, a clinical thermometer used to measure human body temperature might only have measurements ranging from 32°C to 42°C (90-107°F).

The power of magnifier required varies depending on the person, the glasses they already wear and the intended use. If you are trying to boost the small print we would recommend something at around the same strength as the prescription glasses you already wear. This will effectively double the magnification and halve the focal distance. So if your glasses are +2.00 then choose magnifiers with +2.00 also, stronger powers will increase the magnification but at a reduced focal distance.

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A superb range of very affordable clip-on flip-up magnifying lenses for glasses, instantly turn your spectacles into powerful hands free magnifiers when you clip on these magnifying lenses. Ideal for all tasks that require 'hands free' fine detail work such as fishing, embroidery, sewing, jewellery repairs, watch making, modelling and reading small print both at home and at work. Simply clip them onto the frame of your spectacles and flip down when needed then flip up when not for instant normal vision. They're available in four aspheric lens powers from +1.0 dioptre up to +4.0 dioptre and in five different sizes to ensure a perfect fit for your prescription glasses.

Disclaimer: All content on this website is provided for general information only and should not be treated as a substitute for the medical advice of your own doctor or any other health care professional. I-sunglasses Limited is not responsible or liable for any diagnosis made by a user based on the content of this website. Always consult your own GP if you're in any way concerned about your health.