The Journey from Black-Hole Singularities to a Cyclic Cosmology Sir Roger Penrose gives the annual Sir Thomas Gresham lecture on The Journey from Black-Hole Singularities to a Cyclic Cosmology.
The Geometry of Evolution Evolutionary biology raises many unsolved questions: for example, whether evolution...
Doing Business in Interstellar Space Imagine that interstellar trade is possible at speeds close to...