How did a typical galaxy form? - Clues from the old stellar populations of the Milky Way thick disc
How diverse is the asteroid belt?
How do Buried "Compton-thick" AGN Reprocess Their Energy?
How Do Galaxies Grow?
How do the Properties of Allan Hills 84001 Compare With Accepted Criteria for Evidence of Ancient Life?
How do the Relationships Between Crater Landforms Change over Time on a Geologically Dynamic Planet?
How does Clustering depend on Environment?
How does the sun shine?
How Earth's atmosphere evolved to an oxic state: A status report
How false vacuum synthesis of a universe sets initial conditions which permit the onset of variations of a nucleation rate per Hubble volume per Hubble time
How flat is the lower-mantle temperature gradient?
How galaxies gain and lose their angular momentum
How Has the Moon Released Its Internal Heat?
How high can Baumgartner's {\cal I}-ultrafilters lie in the P-hierarchy?
How important is it to integrate riverine suspended sediment chemical composition with depth? Clues from Amazon River depth-profiles
How Important is Steady State Cosmology to Classical and Quantum Electrodynamics?
How incomputable is the separable Hahn-Banach theorem?
How islands cause phytoplankton to bloom in their wakes
How islands stir and fertilize the upper ocean
How Jupiter helped Titan retain a finite orbital eccentricity