Tumblr today added a very important security feature to its service, with the addition of two-factor authentication – an option available within the blogging service’s “Settings” section as of now.

The severity of factor X deficiency varies from person to person. Your body still produces 40% or more of the normal amount of factor X in mild cases. You may have no symptoms or only very minor ones.

In ecology, biotic and abiotic factors encompass all the living and non-living parts of an ecosystem. Biotic factors pertain to living organisms and their relationships. Abiotic factors are the ...