KUT's Two Guys on Your Head, Dr. Art Markman and Dr. Bob Duke talk about when and why to say "thank  you."

Updated at 1:10 p.m. ET

A high-ranking Census Bureau official privately discussed the citizenship question issue with GOP redistricting strategist Thomas Hofeller in 2015, according to emails cited in a new court filing in the legal battle over the potential census question.

The president of Mexico's National Migration Institute, the government agency that controls and supervises migration, resigned Friday.

In a brief statement, the institute announced that Tonatiuh Guillén Lopez presented his resignation to President Andrés Manuel López Obrador. Guillén Lopez, who thanked the Mexican president for the opportunity to serve the country, had been commissioner of the migration agency since December.

The statement did not give a reason for the resignation.

KUT Weekend brings you some of our favorite stories from the KUT newsroom. Updated Fridays.

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Rosa Hidalia Palacios fled El Salvador in April. She crossed into Mexico from Guatemala without a hitch, riding on a little raft that ferries people and goods back and forth. A few hundred yards down the Suchiate River from the rafting route, Mexican immigration enforcement agents watched idly from the official border crossing.

Palacios hasn't made it much farther than the border, as dozens of migration checkpoints cover all roads leading north. She is stuck in a nearby city, Tapachula, Mexico, waiting in line outside the little office of the Mexican Commission for Refugee Aid.

A Texas-based water park company on Thursday announced an agreement to sell two of its attractions and will also give the buyer the right to acquire its Kansas site where a 10-year-old boy was killed nearly three years ago.

U.S. Sen. John Cornyn, R-Texas, said at a news conference Friday that candidates for elected office should contact the FBI if offered political dirt by a foreign government.

The lineups are set for the first Democratic presidential primary debates.

Among the debate matchups: Former Vice President Joe Biden, currently leading in primary polls nationally, will face off against Vermont senator and 2016 candidate Bernie Sanders, as well as California Sen. Kamala Harris and South Bend, Ind., Mayor Pete Buttigieg.

Meanwhile, Massachusetts Sen. Elizabeth Warren will face New Jersey Sen. Cory Booker and Minnesota Sen. Amy Klobuchar.

Three environmental groups are suing the Trump administration to secure federal protection for lesser prairie chickens.

Whataburger announced today that it is selling a majority interest in the company to BDT Capital Partners, LLC, a Chicago-based bank.