Every tree tells a story, but some are beyond eloquent, holding memories, embodying belief, marking sorrow. We hold trees in our imagination, where they grow in strange, wonderful ways in forests ...

Guard cells are pairs of epidermal cells that control gas diffusion by regulating the opening and closure of stomatal pores. Guard cells, like other types of plant cells, are surrounded by a ...

Discover Flagstaff, the world’s first international dark-sky city Discover Flagstaff, the world’s first international dark-sky city How to plan a trip to Sequoia and Kings Canyon National ...