Nostr itself isn't an app or website, but a protocol.

Think of it as a set of rules that allows different apps to communicate with each other in a decentralized way. It's designed for social networking and focuses on privacy and censorship resistance.

Nostter.app is a website that uses the Nostr protocol. From this website you can create a Nostr identity, post messages, and follow others. Since Nostr is decentralized, there are many other Nostr-based apps available.

Like Primal.net another website using the same protocol (using the same secret key),

What is a protocol? Imagine email. Email itself is a protocol, just like Nostr.

Different email providers like Gmail or Yahoo Mail are like the Nostter.app - they use the email protocol to offer their email services.

I found this nice article in another blog

that got me interested in card tricks

And I found this little magic trick that is pretty fun to do, and requires a little preparation

Here is how it is done:

With a deck in card, select one red card, and one black card

put them in front of the audience, and point the red card then pick from the pile 2 cards

and ask the audience to 'guess' which one is red

once the audience has selected one card, show it to the audience and then proceed with the next 2 cards in the pile.

And once 4 cards have been added to each red of black revealed card 

then return the entire stack of cards, and it surprise the audience as they will discover that all cards on the left are red, and on the right are black

See the demonstration here https://youtu.be/d7g4jQ3_Uu4

#!/bin/bash
# ===========================================
# Thumb_export.sh
# ===========================================
# Script called by nautilus-action
# This script can handle multiple selection
# from various directories
# ===========================================
# REP = current directory path
# THB = thumbnail path and filename
# THB_SIZE = size of the thumbnail
# ===========================================
# version 0.02a
# Fri 30 Jan 2009 04:22:32 PM CET

THB_SIZE="184"

for f in "$@"; do
# extracting the current directory and create a thumbnail sub directory
REP=`dirname "$f"`"/thumbnail"
if `test -d $REP`; then echo "thumbnail dir already exists"; else mkdir $REP; fi
THB=`echo $REP`"/`basename $f`"
# now generates the thumbnail with
convert $f -thumbnail $THB_SIZE \( +clone -blur 0x3 +level 20%,100% \) \
\( +clone -gamma 0 -shave 10x10 \
-bordercolor white -border 10x10 \) \
-composite \
\( +clone -gamma 0 -shave 10x10 \
-bordercolor white -border 1x1 \
-bordercolor black -border 9x9 \) \
-compose screen -composite \
$THB
done

xmessage "OK, it's done"