Merge branch 'visualization_earthquakes'
Merge branch 'visualization_earthquakes'
Fixed link to top of page, using just [top](#) not named anchor tag.
Periodict table app; accidentally created in visualization branch.
Merge branch 'visualization_earthquakes'
Added poor rendering of globe.
Added horizontal rule to simple next-home-previous links at bottoms of pages, cleaned up some nav elements.
Merge branch 'master' into visualization_earthquakes