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Ask a quick question
I'm applying to college and don't know which schools I'd be happiest at
My best friend just stopped texting me back and I don't know what I did
I replay the same conversation in my head for hours after it's over
Every screen in my app uses a different shade of blue and I don't know how that happened
My instagram following has been stuck at 800 for two years and I don't know what moves the needle
Our board just added two outside members and I'm scared they're building a case to replace me as CEO
Ask the experts
Nir on why we reach for our phones without deciding to“Your brain has learned that opening social media relieves a quick pang of boredom, loneliness, or uncertainty, so it now cues the habit before you consciously decide.”
Lorraine on getting noticed for your work“Doing great work doesn’t guarantee recognition. Make your impact easy to explain so people can advocate for you when you’re not in the room.”
Guillermo on building Vercel and Next.js“The best things we've done for our brand is the things that we did without thinking we're working on our brand.”
Lenny on breaking into product management“A few paths actually work. The safest is transitioning internally, partnering closely with a PM until you can make the case. The second is joining an early-stage startup where everyone does everything. Regardless of path, become the person who deeply understands the customer and can translate that into product insight.”
John on Building a differentiated business“When you can’t outspend your competitor, give people a reason to choose you that money alone can’t buy.”
Spencer on life inside an NBA organization“I used to think pushing past your body meant toughness, but the league taught me that the hardest skill is staying on the floor.”
Hal on keeping a morning routine alive after a bad night“I learned the hard way that my routine survives only when I make it so small that a bad day can't break it, like doing the 6-minute Miracle Morning instead of an hour.”
Céline on protecting your health in a noisy information world“I protect my health the same way I protect my patients: by curating my information diet the way I curate my food. I go to the source, I follow people who've been right before and correct themselves when the evidence changes, and I stay open to changing my mind. Certainty that cannot bend is not strength; it is a vulnerability.”
Vanessa on sexual expectations couples never say out loud“I don't believe in a universal normal for any stage, but I do think it's completely natural for that early honeymoon frequency to taper off after about a year.”
Peter on which AI tools are worth paying forLed product teams at Meta, Amazon, Roblox and reddit product 0 to 1M+ users.
Guy on keeping customers from churningSold Brightback to Chargebee and CMO at Chargebee.
Pedro on where machine learning is headed“The same basic paradigms have been used since the 1950s. At the end of the day, we’re going to need some new ideas.”
Jason on when to keep fighting and when to wind down“I’ve seen this movie too many times: four months of runway with flat sales usually means the founder never found a repeatable motion, not that the market said no.”
Alastair on handling a teammate who undermines you in meetings“I would name the pattern in private first: I noticed you agreed in the room, then raised concerns afterwards. If you disagree, raise it in the meeting so we can deal with it straight away.”
Madhavan on pricing for profitable growth“Don’t build a product and then ask what to charge. Find out what customers will pay for before you decide what to build.”
Moses on making it to the top when you started with nothing“I had love for the game, parents who kept me grounded, and a city that taught me how to compete. What kept me going was consistency and curiosity. You control what you can control, stack good days, and let the game reward you when it's time.”
Peter on taking back your evenings from your phone“I stopped checking messages after 6 pm and told my team to call twice if it was truly urgent; nothing broke, and I got ten hours back every week.”
Nir on the science of living longer“To delay the biology of aging, we don't prevent just one disease, we prevent many of them. We used to think each age-related disease was separate, but they share common roots. Longevity becomes a side effect of staying healthy longer.”
Matthew on finding the right partner“You want to be happy enough that the right thing doesn’t become your everything.”
Andrej on how far we are from AGILed Tesla Autopilot computer vision team and founding member of OpenAI.
Ask about real life
My mom got lost driving home from the grocery store last week, three miles from the house she's lived in for forty years. She still insists she's fine and gets defensive the second I bring up her memory. My siblings think I'm overreacting, but I found the stove left on twice this month. How do I get her to see what I'm seeing?
I started training twice a day, six days a week, three months ago to prep for a competition. Now I'm exhausted before I even warm up and my sleep is a mess. Is this just what hard training feels like, or have I gone too far?
I turned down a job I wanted because my dad didn't approve of it. I'm 29 and still calling him after every decision to see if it's okay. Last week I almost skipped a trip because he raised an eyebrow. When does this stop being about him and start being about me?
A VP at a large company wants our product for her team, but her CFO is asking for a business case I don’t know how to build
More on Delphi
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Top perspectives
Top perspectivesWriter of Lenny's Newsletter · Host of Lenny's Podcast · ex-Airbnb
“The honest answer: if you're not sure, you probably don't have it yet. When you truly have product-market fit, people are fighting to get in. You're not questioning it.”
Co-founder of Sundial · ex-VP Design at Facebook
“The clearest signal is retention: are the people who try your product coming back without you having to push them? If they are, you likely have product-market fit for a segment. If they aren't, the rest is noise.”
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Their Delphi, answering in their voice
I'm a solo founder and I honestly can't tell if I have product-market fit yet.
If you're not sure, you probably don't have it yet. When you do, people are fighting to get in. Start with the Sean Ellis “very disappointed” survey and look hard at retention. Those two give you the clearest read.
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