This beauty from Jack Fusco is a great way to start the weekend: http://bit.ly/1dk3yI7  pic.twitter.com/5L37KoYHUv

#AnimalOfTheDay: The gerenuk! (Litocranius walleri) pic.twitter.com/8iJEd6eAZ7

Early on, some of the cells in human embryos get their genetic blueprints scrubbed clean: http://ow.ly/NVmk5  pic.twitter.com/Vm8TZdLKTe

.@NASA's @VolcanoCowboy, @RIS4E_SSERVI & @MorningCupOLava practicing for science on Mars http://ris4e.labs.stonybrook.edu/  pic.twitter.com/6LeGQAXDHY

Coming up next: For these endangered sawfish, life found a way. Talking to Andrew Fields @stonybrooku pic.twitter.com/ybwHjmzvtb

One of the DARPA Robotics Challenge robots just fell trying to turn a knob http://pops.ci/L4tBWn  pic.twitter.com/jIoyC6dP9f

#OTD in 2012, Venus transited across the Sun for the last time until 2117 http://go.nasa.gov/JuJKwa  pic.twitter.com/cj7sXVTUtx

Share your outrageous summer photos on Instagram, #OASummer. You could see yours on-air starting 6/20! Get creative! pic.twitter.com/jkPQ1Rs4Ya

Exiled stars explode far from home http://buff.ly/1eRnJy3  pic.twitter.com/j8lyfv4jyG

#RoboSimian set to compete Friday at #DARPADRC 3pm PT/6pm ET Stream, schedule + scoring at http://theroboticschallenge.org  pic.twitter.com/SucTxGYWQJ

After 27 yrs and 2 space missions, @Astro_Nicole retires to be an artist and #STEAM advocator. http://go.nasa.gov/1eTpWsO  pic.twitter.com/ZAgYItKO0Q

On #NationalDonutDay, give thanks to the giant donut that protects our planet http://ow.ly/NVvPd  pic.twitter.com/g0LAxaMEm2

How Europeans brought sickness to the New World http://news.sciencemag.org/2015/06/how-europeans-brought-sickness-new-world?utm_source=twitter&utm_medium=social&utm_campaign=twitter … pic.twitter.com/3xc948QGl5

Seven Billion Dreams. One Planet. Consume with Care. #WorldEnvironmentDay See more at: http://www.unep.org/wed  pic.twitter.com/5k8rSgPFup

Scientists regrew an entire rat limb in the lab: http://bit.ly/1Qu0QMQ  pic.twitter.com/O2Pn9aitZG

Prefer your doughnut brutalist on the outside yet evocative on the inside? Spend #NationalDonutDay at our @hirshhorn pic.twitter.com/vrYbWoM0Gl

Mmm... doughnut with a black hole filling. Happy #NationalDonutDay! Details: http://go.nasa.gov/1HPMYrE  #NASABeyond pic.twitter.com/gDATyxOHJ0

CRISPR is the biggest game changer to hit biology since PCR http://ow.ly/NUFAU  pic.twitter.com/XNZnbM8KFw