Lead Stories

Politics
9:49 am
Tue December 16, 2014

Jeb Bush Announces He Will 'Actively Explore' Presidential Run

Former Florida Gov. Jeb Bush talks to supporters after speaking at the U.S. Cuba Democracy PAC's annual luncheon in Coral Gables, Fla., on Dec. 2.
J Pat Carter AP

Originally published on Tue December 16, 2014 11:06 am

Jeb Bush, the former Republican governor of Florida and the brother and son of two former U.S. presidents, has essentially kicked off the 2016 presidential campaign with a pre-announcement announcement on Facebook.

Saying he had conversations with his family about the future of the country, Bush said he had decided to "actively explore" a presidential run.

He went on:

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Nation
9:02 am
Mon December 15, 2014

Families Of Newtown Victims Sue Rifle Manufacturer

A makeshift memorial with crosses for the victims of the Sandy Hook Elementary School massacre stands outside a home in Newtown, Conn., in December 2013, a year after the shootings.
Robert F. Bukaty AP

Originally published on Mon December 15, 2014 12:24 pm

Family members of some of the victims of the 2012 mass shooting at Sandy Hook Elementary School in Newtown, Conn., have filed a lawsuit against the manufacturer, distributor and seller of the rifle used by the gunman to kill 26 people.

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Nation
5:42 am
Mon December 15, 2014

WATCH: Local Coverage Of Australian Hostage Siege

Originally published on Mon December 15, 2014 1:38 pm

A gunman was holding an unknown number of hostages at a downtown chocolate cafe in Sydney. Early on Tuesday morning, Australian time, police moved in and said the siege was over.

We're following the news here. Below is a feed of the Australian Broadcasting Corporation's news coverage. ABC is the country's national public broadcaster:

World
5:38 am
Mon December 15, 2014

3 People, Including Gunman, Killed In Sydney Cafe Siege

A hostage runs to armed tactical response police officers for safety after she escaped from a cafe under siege at Martin Place in the central business district of Sydney, Australia, on Monday.
Rob Griffith AP

Originally published on Mon December 15, 2014 2:13 pm

(Last updated at 1:48 p.m. ET.)

Just as the siege entered its second day, police stormed a chocolate shop in downtown Sydney, ending a more than 12-hour hostage standoff that began during morning rush hour.

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Science and the Environment
5:11 pm
Fri December 12, 2014

CO2 and the History of Weighing Smoke

The science of weighing carbon gas is tied to Sir Walter Raleigh's attempt to weigh smoke after a wager with Queen Elizabeth I.
Courtesy of Louis Vest, flickr.com/photos/oneeighteen

Originally published on Fri December 12, 2014 11:36 am

Officials from countries around the word have met for the last two weeks in Lima, Peru to talk global climate change.   At the heart of those talks is how to limit billions of tons of CO2 that are pumped into the atmosphere every year from coal burning power plants.  

But how do we keep track of the CO2 we’re releasing? And just how do we weigh something that floats in the first place? 

It turns out there is a venerable history to the science of weighing smoke.

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