5.1K views · 44 reactions | Signals intelligence, or ‘SIGINT’, is the useful information gained from collecting, decrypting and analysing signals. Take a unique glimpse at the history of Australia’s oldest national intelligence organisation at ‘Decoded: 75 Years of the Australian Signals Directorate’. Learn more: bit.ly/3KMw8Sr #DecodedTheExhibition #RevealTheirSecrets #ASD #ASDHistory #75YearsOfASD #OurNMA | National Museum of Australia | Facebook

28K views · 1.1K reactions | Continuing our series of videos and posts to let you #NCLearnAtHome. Though that's where we see them the most, railroad signals are not just for cars at railroad crossings. Signals also govern the movement of trains, indicating when it's safe to proceed, how fast to go, and when and where to stop. Check out the video! And learn more transportation history at www.nctrans.org. #nctrans #nctransportationmuseum #spencershops | N.C. Transportation Museum | Facebook