There is no cure for citrus greening disease.
Many questions remain.
The app allows children to send photos, videos and text messages.
Facebook chief Mark Zuckerberg
Scientists aim to use the sheep as models to study disorders of the brain.
Metal Recycling Businesses Prepare for More Electric Cars
London has been turning to biofuels to cut production of carbon emissions.
Crop loss, drought, floods and rising sea levels are a few of the costly problems tied to climate change.
Swiss flushes gold and silver into sewer.
More than 20 million people live in the capital and surrounding area.