TCP keep alive works by re-sending the previous ack, even though no more data has been received. There is normally no response for ack packets with no data, but for keep-alives servers respond by also re-sending the previous ack. https://github.com/wireshark/wireshark/blob/178e7ce9a533ba9e5e152c9f7bc08f5ba8f25f0b/docbook/wsug_src/WSUG_chapter_advanced.adoc #networking
Europe's Galileo global positioning system had 5 days downtime earlier this month. The satellites were fine, the issue was with the support on the ground. https://www.gsc-europa.eu/news/galileo-initial-services-have-now-been-restored Current status: https://www.gsc-europa.eu/system-status/Constellation-Information #space
Scientists do autopsies on whales and dolphins if they get stranded on a beach.
The Minister's cake
It's a great time to read Sustainable Energy Without The Hot Air, an easy to read book asking if/how we can stop using fossil fuels. There are great ballpark estimates, which make the huge numbers instantly understandable. Free pdf. https://withouthotair.com/
How many disks can you add to a virtual machine?
LightSail 2 will be unfurling its solar sail on Tuesday. The crowdfunded spacecraft plans to accelerate by reflecting sunlight off the solar sail. http://www.planetary.org/blogs/jason-davis/ls2-sail-deployment-live.html #space
Music recommendation: Ecuador by Sash! The song is just so ridiculous and awesome. https://youtu.be/9cQlVww0zKo
Liquid chromatography in beer glass. Draw line in felt-tip 2cm from the bottom of kitchen towel. Place in 1cm deep water. Water carries felt-tip mark upwards. Chemicals have different friction from paper, so colours separate. #chemistry
A new process to make ammonia
Does the news reflect what we die from?
My review of the new @Raspberry_Pi@twitter.com 4 is on @firstname.lastname@example.org :) Super happy with the review.
Up close with NeNe Geese at #london wetland centre
This is the Mastodon server used by @h2g2bob. Most posts are public, take a look around. Why not take a look at dbatley.com for other interesting stuff.