Mark Mortimer

Titan Unveiled

[/caption] Take a layer off a Matryoshka doll and you find more of the same. Try to answer questions about…

14 years ago

[/caption] The National Geographic Society publishes popular accounts of a vast quantity of information related to the natural sciences. The…

14 years ago

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[/caption] Passion drives us to do things beyond mere instinctive survival. Varied and distinct, these pastimes can absorb hours and…

14 years ago

[/caption] If there’s no bread, then eat cake. Some say this diet plan would satisfy everyone’s dreams. But up in…

15 years ago

[/caption] The major shortcoming of current chemical powered rockets lies in the ratio of payload to fuel. The dream of…

15 years ago

[/caption] The English language continually evolves. Just see Ambrose Bierce's definition of dictionary. New concepts call for new words that…

15 years ago

[/caption] When is the best answer not the right answer? Assuredly many historical events epitomize this dilemma. Randall Whitcomb digs…

15 years ago

[/caption] We work hard to put food on the table and a roof over our heads. If lucky, we've got…

15 years ago

[/caption] With all the probes recently landing on Mars, it's no wonder we feel that the planet is close enough…

15 years ago

[/caption] Being part of a series on a "people's history of spaceflight", Chris Gainor's book entitled "To a Distant Day…

15 years ago