The current NASA spacesuits use gas to maintain atmospheric pressure inside the suit. While necessary for the astronauts to survive, it makes the suits very difficult to work in. MIT astronautics engineer Dava Newman has developed a solution: A flexible, protective suit that applies the pressure needed directly to the astronaut’s body. Her suit will give astronauts new flexibility and range of motion as we look forward towards the exploration of other planets.
By: World Science Festival Staff
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We hear about calories all the time: How many calories are in this cookie? How many are burned by doing 100 jumping jacks, or long-distance running, or fidgeting? But what is a calorie, really? And how many of them do we actually need? Emma Bryce explains how a few different factors should go into determining the recommended amount for each person.
Lesson by Emma Bryce, animation by Qa’ed Mai.
Please note that 1 Cal = 4.18 kJ
This activity is courtesy of Flinn Scientific Canada.
Use this popular, simple exercise to introduce some levity into the classroom and as an opportunity to demonstrate the importance of careful observations.
- What is life?
- Raisins, 10 to 20
- Beaker or similar transparent container, 1000-mL
- Carbonated beverage that could pass for “sewer-water” (i.e., 50/50,® Squirt,® or Mountain Dew®), 500 mL
There are no real hazards involved with this exercise as long as scrupulously clean beakers or non-lab containers are used. Laboratory glassware that may have previously contained any chemicals or solutions should be avoided. Normally food should not be eaten in the laboratory—this may be one exception for dramatic effect. Remind students to never eat in the lab—this is a “special” demonstration.
Click here for a printer-ready version of the complete activity including procedure and discussion tips.
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