TIL, despite its vastness, it only takes 39-40 digits of pi to calculate the size of the observable universe to an accuracy of 1 hydrogen atom. Because of this, NASA uses only
T-Shape GPIO Extension Board with 40-pin Ribbon Cable for Raspberry Pi
Amazon.com: Micro Connectors Raspberry Pi 40-pin GPIO 1 to 2 Expansion Board (RAS-GP02),Green : Electronics
Argon ONE V2 Case for Raspberry Pi 4 – Argon 40 Website Store
Amazon.com: 40 Removable Stickers: Pi Symbol, Pi Day Math Party Favors, Decals : Toys & Games
4 & 40 Pin Extra Tall Header (Push Fit Version) - POE HAT Set - PiShop.us
![GPIO Ribbon Cable for Raspberry Pi Model A+/B+/Pi 2/Pi 3/Pi 4 [(40 pins)] : ID 1988 : $2.95 : Adafruit Industries, Unique & fun DIY electronics and kits](https://cdn-shop.adafruit.com/970x728/1988-00.jpg "GPIO Ribbon Cable for Raspberry Pi Model A+/B+/Pi 2/Pi 3/Pi 4 [(40 pins)] : ID 1988 : $2.95 : Adafruit Industries, Unique & fun DIY electronics and kits")
GPIO Ribbon Cable for Raspberry Pi Model A+/B+/Pi 2/Pi 3/Pi 4 [(40 pins)] : ID 1988 : $2.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Amazon.com: Micro Connectors Raspberry Pi 40-pin GPIO 1 to 2 Expansion Board (RAS-GP02),Green : Electronics
Pi Case 40 Raspberry Pi 4 Enclosure | Cooler Master
Preassembled 40-pin Pi Wedge Hookup Guide - SparkFun Learn
Pi Case 40 V2 Raspberry Pi 4 Enclosure | Cooler Master
Amazon.com: Micro Connectors Raspberry Pi 40-pin GPIO 1 to 2 Expansion Board (RAS-GP02),Green : Electronics
GitHub - othermod/40-Pin-Raspberry-Pi-DPI-LCD-Topper
Preassembled 40-pin Pi Wedge Hookup Guide - SparkFun Learn
Pi Case 40 by Cooler Master — Kickstarter
Cooler Master Pi CASE 40 for Raspberry Pi 4 (GPIO WARNING!) - Martin Rowan
Raspberry Pi RP2040 pHAT board comes with a 40-pin GPIO header - CNX Software
pi40 Keyboard Kit » 1upkeyboards
Raspberry Pi DPI Topper for 40-Pin LCD (24-Bit RGB 888 Version) – othermod
Simple Guide to the Raspberry Pi GPIO Header - Raspberry Pi Spy
RS-40 Compact Rotation Stage
![Assembled Pi Cobbler Plus - Breakout Cable [for Pi B+/A+/Pi 2/Pi 3/Pi 4] : ID 2029 : $6.95 : Adafruit Industries, Unique & fun DIY electronics and kits](https://cdn-shop.adafruit.com/970x728/2029-00.jpg "Assembled Pi Cobbler Plus - Breakout Cable [for Pi B+/A+/Pi 2/Pi 3/Pi 4] : ID 2029 : $6.95 : Adafruit Industries, Unique & fun DIY electronics and kits")
Assembled Pi Cobbler Plus - Breakout Cable [for Pi B+/A+/Pi 2/Pi 3/Pi 4] : ID 2029 : $6.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Pi Case 40 Raspberry Pi 4 Enclosure | Cooler Master
Raspberry Pi Documentation - Raspberry Pi hardware
pi40 Keyboard Kit » 1upkeyboards
Amazon.com: GeeekPi Micro Connectors Raspberry Pi 40-pin GPIO 1 to 2 Expansion Board 2 x 20-pin Strip Dual Male Header Double Row Straight GPIO Connector Pin Header Compatible with Raspberry Pi(2Pack) : Electronics
PiBorg | 40-Pin Female Header
