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Favorites
ArXiv Number theory Mathscinet Thefreedictionary Sage Cell Server Wolfram Alpha	Biographies of mathematicians Astronomy Picture of the Day Mathematicians Of The Day DRAE Wikipedia

Personal web pages
Andre Assis Javier Cilleruelo Keith Conrad Antonio Córdoba Rafael Garcia-Molina Andrew Granville	Jesús Guillera Carlos Ivorra James S. Milne Andreas Strömbergsson Peter Woit Doron Zeilberger

Mathematical centers
MSRI IAS Rutgers Math Department Politècnica de Catalunya (Mat.)	Autònoma de Barcelona (Mat.) Autònoma de Barcelona (Mat. i Inf.) Complutense de Madrid (Mat.) ICMAT

Lecture notes
Carlos Ivorra James S. Milne AMS Open Math Notes K. Conrad expository papers	M. Levi "Math. curiosities" Lecture notes in number theory Algebra course notes The Feynmann lectures on Physics

Databases, repositories
MathScinet zbMATH Royal Society Publishing Arxiv Göttinger Digitalisierungszentrum DigiZeitschriften Portal Científico (UAM) Apoyo a la investigación (UAM) Impact factor (Universidad Sevilla)	WOS through FECYT NIST Digital Library of Mathematical Functions The L-functions and modular forms database Number theory web Erdős papers Ramanujan's papers Astrophysics data system (ADS) iNSPIRE HEP OEIS

Science blogs
John Baez Terence Tao La ciencia de la mula Francis Gaussianos	Not even wrong (P. Woit) The Spectrum of Riemannium Antonio Pérez Sanz Caminos aleatorios

Science videoblogs and podcasts
Numberphile Periodic videos Sixty symbols Minute Physics Arvin Ash Veritasium Mathologer Brian Keating PBS Space Time Science without the Gobbledygook Quantum Fracture	Dr. Becky ElectroBOOM Pretty much Physics Sabin Civil Engineering Branch education Real Engineering Steve Mould Dr Physics A Ludic science Mathemaniac matem1nuto

Video lectures, meetings, seminars
MSRI Streaming video until 2004 IAS video lectures Théorie analytique des nombres IHES 2014 Experimental math (Rutgers) Analytic Number Theory MSRI 2017	Recent developments in Analytic Number Theory MSRI 2017 Columbia University (Math) Tobias Osborne channel Javier Garcia channel

Bizarre scientific questions
Human body in outer space Lightning strike usually nonlethal Celebratory gunfire Moon illusion Improbable research (Ig Nobel) What if	Landing on Jupiter Landing on Saturn The danger of falling objects Electrocution in water Pain and electric frequency

Programming and web development and design
w3schools Icons CSS templates SDL	Numerical Recipes C Cheat sheet (Silverman) Linux Command Line Cheat Sheet Unity

Online applications
Sage Cell Server Sage interactions Wolfram Alpha Magma calculator Audio youtube to MP3 Cut audio file Online converter Zamzar file conversion Detexify LaTeX symbol converter LaTeXML's Web Server	Tables generator pandoc online Timers Dictionary of real numbers Inverse symbolic calculator Speller and grammar checker DeepL Google translator Reverse image search Figlet Server Figlet Server 2

Miscellanea
LaTeX Templates Overleaf LaTeX Documentation Revista Pensamiento Matemático Cercanías Madrid Fridrich Rubik cube page Dave Hax channel rtve Play tvguia short of the week Jamendo	Photopin Unsplash (photos) Endangered languages Románico digital Cheat sheets Malaprensa Alba learning Fundación Juan March Science podcasts duckduckgo