Someone on Reddit built an open-source canvas where you handwrite math and physics on a whiteboard, and Claude responds right next to your handwriting. In real time.
It's called PenEcho. You sketch equations, draw diagrams, scribble notes wherever they make sense. When you pause, it sends that region to the model. The response appears beside your work. Not in a chat window.
On the whiteboard itself.
The canvas is 20,000 x 20,000 pixels but only loads tiles where ink exists. Each request costs a few cents. Runs locally. Supports Claude, OpenAI, and Codex.
The builder said something that stuck with me: six months ago, no model could have done this. Not the handwriting recognition.
The fact that it understands unfinished equations, rough diagrams, and the spatial relationship between them. It infers what you meant from incomplete marks.
This is how research should work. Think on a whiteboard. AI thinks with you. No copy-pasting into a chat box. No breaking your train of thought.
Your Guide to CHIKKAMAGALURU
Ideal vacation: 3 days
Main attractions:
Mullayanagiri
Hebbe falls
Baba budangiri
Jhari falls (buttermilk falls)
(Both Hebbe and Jhari falls arent directly accessible and requires jeep ride)
Do visit the architectural wonders, Halebidu Hoysaleswara Temple & Belur Chennakeshava temple...a short detour from Chikkamagaluru that is absolutely worth it !!
Complete map with several attractions & optional day tours info below
#YogiTravelTales
If you want to buy a water purifier, please don’t blindly go for a RO
First of all, check the TDS of your water source. TDS meters are available at very cheap cost. If TDS is less than 150 and there is always the same source of water across seasons, most likely you don’t need a RO ( unless there are heavy metals in your water)
Eg: Many places in Mumbai and MMR won’t need a RO and RO is an overkill as the BMC sends treated water. You will spend a lot extra and you will also waste a lot of water. And the water you drink will also get stripped of all minerals. A simple UV water purifier which costs 7-8k will be enough. Maintenance cost will be way lower
Most brands won’t say this out load as they make more money selling RO and even more money by selling spares and AMC of RO
Even we don’t have a non RO model, but you should only sell the product to consumers who need your product. Not by creating unnecessary fear