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The discovery of many fossil plants and clues from molecular genetics is starting to shed light on the relationship between angiosperms and other plants, and the sequence in which the unique features of angiosperms evolved.
A host of recently discovered fossils shows that mammal evolution was less a linear tale than a complex bush, in which mammalian feature evolved repeatedly in separate lineages, and were sometimes lost.
Inertial frames of reference permeate our daily life, such as the pull and push that is felt when a vehicle brakes or turns. These inertial and centrifugal forces arise because of changes in velocity relative to uniformly moving inertial frames. In the context of the theory of general relativity, a spinning mass was predicted to 'drag' inertial frames along with it. This paper reviews the current state of the measurement of frame dragging using satellites orbiting Earth.