What NASA’s twin tests will teach us about life in space

What are the long-term effects of living in space? Astronaut Scott Kelly is now halfway through a year-long mission. NASA offers a progress report, comparing Scott with his twin brother, retired astronaut Mark Kelly, who remains on Earth.

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Republican National Convention - Day 1

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Democratic National Convention - Day 4

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Democratic National Convention - Day 3

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PBS NewsHour/NPR RNC Special - Day 3

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PBS NewsHour/NPR RNC Special - Day 3

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Length 2:59:39 Premiere Date 07/19/16

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Length 56:36 Premiere Date 06/01/16

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Length 1:32:13 Premiere Date 10/11/12

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Length 3:24:01 Premiere Date 09/07/12

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Democratic National Convention: September 4, 2012 (Part 2)

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Democratic National Convention: September 4, 2012 (Part 1)

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Republican National Convention: August 29, 2012 (Part 1)

Length 1:42:52 Premiere Date 08/30/12

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Special Report: America Remembers 9/11

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PBS News Hour - S143 E70

Wednesday October 7, 2026 3:00 am ET on KETWORLD
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PBS News Hour - S143 E69

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PBS News Hour - S143 E68

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PBS News Hour - S143 E67

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PBS News Hour - S143 E66

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What NASA’s twin tests will teach us about life in space

Recent Episodes

October 30, 2026 - PBS News Hour full episode

October 29, 2026 - PBS News Hour full episode

October 28, 2026 - PBS News Hour full episode

October 27, 2026 - PBS News Hour full episode

October 26, 2026 - PBS News Hour full episode

October 23, 2026 - PBS News Hour full episode

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Clips & Previews

Ambassador: Europe was ‘ill-prepared’ for refugee deluge

To win with women, how can the GOP ramp up its appeal?

What NASA’s twin tests will teach us about life in space

Teaching girls to write the rules at video game coding camp

A doctor’s memoir shows race matters in the hospital room

Killing of tourists highlights Egypt-U.S. tension over aid

Shifts in Climate Shifting Sea Turtles

Archaeologists in Peru add drones to their list of tools

What’s next in the global response to Ebola?

Mexico’s President Nieto faces ‘perfect storm’ of problems

Is the new GED test an educational improvement or setback?

How should U.S. regulate powerful painkillers?

Biden emcees swearing-in ceremonies with hugs and selfies

Specials

Bruce Springsteen: Finding America in Song

President Trump address to the nation — PBS News Special Report

War with Iran | PBS News Special Report

President Donald Trump’s 2026 State of the Union Address

Trump addresses the nation from the White House

President Donald Trump's 2025 address to Congress

The 2nd Inauguration of Donald J. Trump | PBS News Special

Biden’s farewell address from the White House | PBS News Special Report

Remembering Jimmy Carter | PBS News Special

PBS News Election Night 2024

Harris addresses supporters after losing 2024 presidential election

Run, Hide, Fight: Growing Up Under the Gun

Crossroads: A conversation with America – A PBS News Special

What happened in the first Harris-Trump debate of 2024

2024 Democratic National Convention | DNC Night 3 | PBS News special coverage

2024 Democratic National Convention | DNC Night 4 | PBS News special coverage

2024 Democratic National Convention | DNC Night 2 | PBS News special coverage

2024 Democratic National Convention | DNC Night 1 | PBS News special coverage

Biden's addresses the nation after 2024 exit | PBS News Special Coverage

Tipping Point: Colorado River Reckoning

2024 Republican National Convention | RNC Night 3 | PBS News special coverage

2024 Republican National Convention | RNC Night 4 | PBS News special coverage

2024 Republican National Convention | RNC Night 2 | PBS News special coverage

2024 Republican National Convention | RNC Night 1 | PBS News special coverage

Biden's Oval Office address on Trump’s attempted assassination

What happened in the first Biden-Trump debate of 2024

President Joe Biden’s 2024 State of the Union Address

Super Tuesday 2024 - PBS NewsHour special coverage

New Hampshire Primary - PBS News Special Report

Iowa Caucuses - PBS News Special Report

America at a Crossroads with Judy Woodruff

President Biden's Address to the Nation

War in the Holy Land: A PBS News Special Report

President Biden Addresses the Nation

President Joe Biden’s 2023 State of the Union Address

President Zelenskyy Address to Congress

President Zelenskyy Address to Congress

Beyond the Canvas | Season 3 | Episode 5

2022 Midterm Elections|PBS NewsHour Special Coverage|Part 1

2022 Midterm Elections|PBS NewsHour Special Coverage|Part 2

Ricochet: An American Trauma

Beyond the Canvas | Season 3 | Episode 4

Queen Elizabeth - A Royal Life

The January 6th Hearings - Day 8

The January 6th Hearings - Day 7

The January 6th Hearings - Day 6

The January 6th Hearings - Day 5

The End of Roe: A PBS NewsHour Special Report

The January 6th Hearings - Day 4

The January 6th Hearings - Day 3

The January 6th Hearings - Day 2

The January 6th Hearings - Day 1

Beyond the Canvas | Season 3 | Episode 3

Beyond the Canvas | Season 3 | Episode 2

Beyond the Canvas | Season 3 | Episode 1

Searching for Justice: Life after Lockup