Hackernews posts about S21

S21 is a class of companies that received funding from Y Combinator's Summer 2021 batch of startups.

Launch HN: Exa (YC S21) – The web as a database

412 points by willbryk 27 days ago | 133 comments
Ask HN: What is your backup plan in case you don't get into YC S25?

2 points by rblion 20 days ago | discuss
Relaunch Commissary Club (YC S17): AI Eats Reentry

2 points by RBBronson123 20 days ago | discuss
MIT 6.S191: AI for Biology [video] (www.youtube.com)

2 points by mfiguiere 28 days ago | discuss
Galaxy S25 Edge: Redefining Phones with Bold Design and AI (techday.blog)

1 points by audai about 18 hours ago | discuss
Nostalgic Soundscapes S01E02 – Forgotten – Windows 95 Retro Ambient [video] (www.youtube.com)

1 points by keepamovin 5 days ago | discuss
Show HN: Wabbit S2: Welcome to The Matrix of AI (Rube Goldberg Nokia 8110 4G?) (blog.walledgarden.ai)

1 points by bishopsmother 10 days ago | discuss
Show HN: Toffu AI is a Vibe Marketing agent (toffu.ai)

1 points by orarbel1 12 days ago | discuss
Ukraine destroys more than 40 military aircraft in drone attack deep in Russia (www.npr.org)

306 points by consumer451 about 22 hours ago | 438 comments
Heat stress mitigation by trees and shelters at bus stops (www.sciencedirect.com)

144 points by rntn 28 days ago | 133 comments
Former Supreme Court justice David Souter has died (www.npr.org)

86 points by danso 24 days ago | 46 comments
Ukraine destroys more than 40 military aircraft in drone attack deep in Russia (www.npr.org)

74 points by zzzeek about 20 hours ago | 2 comments
Tufts graduate student Rümeysa Öztürk released from immigration detention (www.npr.org)

59 points by colinprince 22 days ago | 5 comments
Ancient DNA from the green Sahara reveals ancestral North African lineage (www.nature.com)

53 points by gnabgib 29 days ago | 6 comments
FDA moves to ban fluoride supplements for kids, removing a key tool for dentists (www.npr.org)

51 points by healsdata 19 days ago | 43 comments
ChatGPT Helps Students Feign ADHD: An Analogue Study on AI-Assisted Coaching (link.springer.com)

45 points by paulpauper 13 days ago | 46 comments
High-income groups disproportionately contribute to climate extremes worldwide (www.nature.com)

43 points by slow_typist 23 days ago | 18 comments
Why some friendships end after kids come into the picture (text.npr.org)

36 points by mooreds 15 days ago | 82 comments
In-Memory Ferroelectric Differentiator (www.nature.com)

33 points by PaulHoule 25 days ago | 1 comments
Vagus nerve stimulation therapy for treatment-resistant PTSD (www.brainstimjrnl.com)

32 points by bookofjoe 26 days ago | 11 comments
Lawful kinematics link eye movements to the limits of high-speed perception (www.nature.com)

31 points by bookofjoe 20 days ago | 5 comments
Elizabeth Holmes' partner raises millions for new biotech testing startup (www.npr.org)

29 points by sseagull 23 days ago | 14 comments
Engineered adipocytes implantation suppresses tumor progression in cancer models (www.nature.com)

26 points by richardboegli 27 days ago | discuss
Reducing Huntington’s-related repeat expansions in patient cells and in mice (www.nature.com)

25 points by bookofjoe 6 days ago | 5 comments
Sieving pores: stable,fast alloying chemistry of Si -electrodes in Li-ion batt (www.nature.com)

25 points by bookofjoe 7 days ago | 1 comments
Diseases are spreading. The CDC isn't warning the public like it was months ago (www.npr.org)

20 points by bookofjoe 12 days ago | 3 comments
Women who hate men: a comparative analysis across extremist Reddit communities (www.nature.com)

18 points by mpweiher 1 day ago | 18 comments
Former Palantir workers condemn company's work with Trump administration (www.npr.org)

17 points by coderatlarge 24 days ago | 1 comments
'Which is it?' RFK Jr. waffles on cuts to lead poisoning prevention efforts (www.npr.org)

16 points by ndsipa_pomu 9 days ago | discuss
RFK Jr. says autism database will use Medicare and Medicaid info (www.npr.org)

15 points by danso 24 days ago | discuss