Republican presidential candidate Donald Trump’s greets the crowd during a rally in Dubuque, Iowa, this week. Photograph: Reuters/Ben Brewer

Donald Trump, the frontrunner in the polls to become the Republican presidential nominee next year, has courted controversy again on the campaign trai(...)

US border patrol agents detaining undocumented immigrants  after they crossed the border from Mexico into Texas. Photograph: John Moore/Getty Images

“Anyone truly interested in US-Mexican border issues needs to stay for more than an afternoon,” says Judith Zafferini, a Democratic state senator for (...)

Republican presidential candidate Donald Trump spars with Univision reporter Jorge Ramos before his “Make America Great Again Rally” at the Grand River Center in Dubuque in Iowa on Tuesday. Photograph: Ben Brewer/Reuters 0:50

Jorge Ramos, an anchor with the Spanish-language Univision network, was removed from Donald Trump’s news conference in Dubuque, Iowa, on Tuesday af(...)

Noise pollution  can transmit across thousands of square kilometres of ocean, causing physical injury, disorientation and death to whales and dolphins. Photograph: Simon Duggan/Provision

Whale and dolphin activity on Ireland’s continental shelf is being measured off the west coast this week by a 21-metre yacht known to be one of the (...)

Skulls are partially unearthed at the Templo Mayor Aztec ruin site in Mexico City. Photograph: Hector Montano/Institute of Anthropology and History

Archeologists have discovered a massive ceremonial skull rack from the heyday of the Aztec empire in the heart of Mexico City, a find that could shed (...)

US  presidential candidate Donald Trump at Manhattan Supreme Court in New York on Monday, where he appeared for jurty duty. Trump’s  hard line on immigration has driven rivals to match his biting anti-immigrant language. Photograph: Lucas Jackson/Reuters

Republicans thought they had learned a lesson after 2012: Turning off Latino voters ensures defeat in the general election. But as the disruptive US p(...)

David and Stephen Flynn (above) are the dynamic duo behind The Happy Pear natural food market and family-friendly cafe and restaurant in Greystones, Co Wicklow

It can be hard to come up with bright ideas for tasty, nutritious lunchbox fillers – especially on cold dark mornings when you’re trying to get eve(...)

In India, fertility rates are  down to 2.48 children per woman. Photograph: Reuters/Danish Ismail

For the past 200 years the global population has risen explosively. There were 1 billion humans in 1850. There are 7.3 billion today. Ever since the I(...)

Relatives gather near the casket of Miguel Angel Jimenez, leader of the community police of Guerrero State, during his wake in Xaltianguis in the state of Guerrero. Photograph: Reuters.

At least fifteen people were killed during the weekend in Mexico’s southwestern Guerrero state, including an activist who led efforts to find 43 st(...)

Rev Patrick Comerford speaks at a ceremony to commemorate the Hiroshima and Nagasaki bombing victims in Merrion Square in Dublin. Photograph: Sara Freund/The Irish Times

The Government has been urged to take a lead role in an international campaign to ban nuclear weapons. Speaking at a memorial for the victims of the (...)