Generated by Codex with GPT-5
MEDIUMLinked List, Math, RecursionTwo linked lists represent two non-negative integers. Each node stores one digit, and the digits are already in reverse order, so the ones place comes first.
Continue ...Generated by Codex with GPT-5
MEDIUMHash Table, String, Sliding WindowGiven a string, the goal is to find the length of the longest contiguous block of characters with no repeats.
The important word is contiguous. This is not asking for a subsequence that can skip characters. It is asking for one unbroken window inside the string.
Continue ...Generated by Codex with GPT-5
MEDIUM64.1Two Pointers, String, Dynamic ProgrammingGiven a string, return the longest contiguous substring that reads the same forward and backward.
The word “substring” is the important constraint. This is not about picking scattered characters. The answer has to be one continuous block inside the original string.
Continue ...Generated by Codex with GPT-5
MEDIUMArray, Hash Table, Prefix SumThe input is an integer array and a target k.
The task is not to find the longest subarray or to return the subarray itself. It is simply to count how many contiguous subarrays add up to k.
Generated by Codex with GPT-5
This article is about a change in how astronomers see the universe.
For a long time, space was often described as majestic but slow. Galaxies evolved over billions of years, stars lived and died over immense stretches of time, and most cosmic change seemed far removed from ordinary human experience. Ann Finkbeiner argues that this picture is now incomplete. Modern surveys are revealing a universe full of sudden, violent, short-lived events called transients: flashes that can appear without warning, blaze with absurd amounts of energy, and then fade on timescales of seconds, days or months.
Continue ...Generated by Codex with GPT-5
This summary covers The Economist’s March 28th, 2026 Science & technology article listed in the contents as NASA's updated Moon-base plans and headlined on the page as Back to stay.
The article argues that NASA is trying to turn its Moon programme from an awkward, overcomplicated prestige project into something more durable. Instead of treating the next crewed landing as the main event, the agency now wants that landing to be the start of a longer campaign: repeated visits, more equipment on the surface and eventually a real base.
Continue ...Generated by Codex with GPT-5
Eric Engerbretson’s piece reads like a farewell to a beloved hang gliding landmark, but its real subject is infrastructure. Wallaby Ranch was not just a nice place to fly. It was a carefully built system for introducing people to hang gliding safely, repeatedly, and with enough comfort and joy that many of them stayed in the sport.
Continue ...Generated by Codex with GPT-5
Maeve Callahan opens “Rapid Fire” with the sort of moment that instantly strips a big objective of any glossy hero narrative. Mali Noyes is edging across steep spring snow above a 75-foot drop, trying to clip into an anchor, when a wet slide cracks loose above her. She survives because she is already close to safety and because Spencer Harkins, her partner, is right there to grab her pack straps. That near miss becomes the article’s emotional key. Noyes’ push to ski all 93 lines in Andrew McLean’s The Chuting Gallery in record time is impressive on paper, but Callahan is more interested in the strain hidden inside the numbers: how a project like this magnifies pressure, compresses decision-making and tests even a highly skilled skier’s sense of trust in herself.
Continue ...Generated by Codex with GPT-5
This article is about a long-standing astronomical goal that is suddenly starting to look achievable: directly detecting the universe’s first generation of stars.
These stars, usually called Population III stars, formed when the cosmos was still chemically simple. They were made almost entirely of hydrogen and helium because heavier elements did not exist yet in meaningful amounts. That makes them important not just because they were first, but because they helped transform the universe from a relatively plain place into one rich enough to produce later stars, planets and, eventually, life.
Continue ...Generated by Codex with GPT-5
This piece was surfaced directly from TBPN, and the original post is Andy Jassy Resets AI Narrative.
TBPN uses Amazon CEO Andy Jassy’s latest shareholder letter to argue that the AI conversation is starting to move away from daily model drama and toward industrial scale. Instead of dwelling on the back-and-forth around Anthropic’s Mythos rollout, the post zooms out and asks a bigger question: what does it mean when one of the world’s largest companies talks about AI as a capital cycle large enough to reshape its entire business?
Continue ...