Image of the Day May 20, 2026
Psyche looks back at a crescent Mars
NASA’s Psyche spacecraft took this view of Mars during the gravity-assist flyby that redirected it toward the metal-rich asteroid it is built to visit. The image is useful because it is not the mission’s destination: it is navigation, instrument checkout and planetary science happening in the same manoeuvre. Mars appears as a crescent because Psyche was seeing the planet from a geometry familiar from lunar phases, with sunlight catching only part of the disk. For a spacecraft en route to an asteroid, the flyby is a reminder that deep-space missions are chains of bargains with gravity, optics and timing.
Credit · NASA/JPL-Caltech/ASU
On This Day 151 years ago
1875
The Metre Convention creates a shared language for measurement
On May 20, 1875, representatives of 17 nations signed the Metre Convention in Paris, creating the international framework for measurement that still underpins modern science and engineering. The treaty created what became the International Bureau of Weights and Measures, giving countries a way to agree on standards rather than maintain incompatible local systems. That sounds bureaucratic until you follow the chain: semiconductor fabrication, drug dosing, orbital navigation, climate records and laboratory reproducibility all depend on trusted units. World Metrology Day is a useful reminder that precision is not only a property of instruments. It is also an institutional habit.
Paper of the Day arXiv · cs.LG
AgentNLQ: A General-Purpose Agent for Natural Language to SQL
arXiv cs.AI authors
AgentNLQ, posted in today’s arXiv cs.AI feed, sits in the practical seam between language models and databases: turning natural-language questions into SQL reliably enough for production use. The title suggests a general-purpose agent rather than a single benchmark prompt, which is where the operational interest lies. Teams already have dashboards and BI tools; the hard part is giving non-specialists safer access to data without handing an LLM arbitrary authority over schemas, permissions and expensive queries. Treat it as a pointer for later reading rather than a settled result: the useful questions are evaluation coverage, guardrails, and whether the agent knows when not to run a query.
arXiv:2605.19010 →