HHMI's Holiday Lectures on Science The Howard Hughes Medical Institute is a philanthropy that supports biomedical research and science education. As part of its mission to strengthen science education, the Institute presents the Holiday Lectures on Science, an annual series that brings the latest developments in a rapidly moving field of research into the classroom. These lectures are videotaped and technical, but even the lay person can learn from them. Audio files are available, but you do lose the visual aids. However, they are still useable. Previous subjects have included, dengue, RNA, and the idea of quorum sensing which is how bacteria decide when to attack, or fireflies coordinate their flashing sequence.
By Howard Hughes Medical Institute
The operation of electric heaters to heat an area for a long period of time is generally considered to be costly. However, intermittent or partial day use can be more cost efficient than whole building heating due to superior zonal control. Your Space Heater Example: A lunch room in an office setting has limited hours of operation. During low use periods a "monitor" level of heat (50 °F/10 °C) is provided by the central heating system. Peak use times between the hours of 11:00–14:00 are heated to "comfort levels" (70 °F/21 °C). Significant savings can be realized in overall energy consumption since infrared radiation losses through thermal radiation are not as large with a smaller temperature gradient both between this space and unheated outside air as well as between the refrigerator and the (now cooler) lunch room. Economically, electric heat can be compared to other sources of home heating by multiplying the cost per kilowatt hour by the number of kilowatts the heater uses.
By Heaters Heat