this should work with some salts... I know they are using salts in a 30 Mw power plant in brazil or something to that extent. it uses mirrors to concentrate sunlight on a tower, top of which has capilaries with water that will produce steam to power the turbine, but their new 30Mw power station will have the top made of some salt that retains heat rather well.... i dont know if it would heat up in a microwave, though i doubt that it wont, then all you need is 2 conainers, some salt in the middle, close it all off, and shazaam, you got a microwaverable hot water bottle that will remain hot for hours or something like that

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Microsoft, the leader in using innovative tactics to promote irksome experience, coupled with antiquated technology that's held together by a pyramid of makeshift afterthoughts.
Apple, the leader in using irksome tactics to promote innovative experience, coupled with an antiquated core that's enhanced by state-of-the-art afterthoughts.
Linux, the leader in not using any tactics to promote user-defined experience, coupled with state-of-the-art core enhanced by innovative afterthoughts.
