CONCEPTS: atom, electron, proton

GEN: atoms have no overall charge and so contain the same number of protons as electrons .

CONCEPTS: couple, grape, vineyard

GEN: happy couple examining grapes in vineyard on a sunny day

CONCEPTS: home, novelist, write

GEN: this historic home where novelist allegedly wrote book is now up for sale .

CONCEPTS: mate, nest, specie

GEN:
biological species comes out to join her mate outside the underground nest .