diff --git a/docs/python/django.md b/docs/python/django.md
index ace25dd..93e4663 100644
--- a/docs/python/django.md
+++ b/docs/python/django.md
@@ -12,6 +12,12 @@ datetime.datetime(2005, 8, 20, 13, 35, 12)
 >>> s.get_decoded()
 {'user_id': 42}
 ```
+```
+>>> from django.contrib.sessions.backends.db import SessionStore
+>>> s = SessionStore()
+>>> s_data = ".eJxVjEEKwjAQAP-yZymbtomJJ_UjYTddqWhbyTaoiH-3RRC8DjPzgiyDDCw5DgK7ORfZQKQy97HoAkdaMQTyLbNhzxjarjaek_O1NQFdwpN1-7WorlOiK_z1TOkiYxfrZaJCfeGKSaWilKYyzlodFvX4ldZSRfU8jVEet3N-ws5h6xE3cCPV-5S7n_ADPWkfL7K4wLY2fApbRkOI6H0jDTvDNtjGNMbB-wMgXU_Z:1rGcFf:4Y53efIteKjKKAkWbOHhT3D6n3Yk0Z_vca2yDP8N-Dc"
+>>> decoded_data = s.decode(s_data)
+```
 
 ## Database
 
diff --git a/docs/tools/science-online.md b/docs/tools/science-online.md
index e90a356..2f7815e 100644
--- a/docs/tools/science-online.md
+++ b/docs/tools/science-online.md
@@ -1,4 +1,93 @@
-# tools/science-online.md
+# Science Online
+
+## 国内源
+
+### pip
+
+```
+vi ~/.pip/pip.conf
+
+[global]
+index-url = https://pypi.tuna.tsinghua.edu.cn/simple
+[install]
+trusted-host = https://pypi.tuna.tsinghua.edu.cn
+```
+
+### github
+
+```
+git config --global url.https://kkgithub.com/.insteadOf https://github.com/
+```
+
+### homebrew
+
+https://mirrors.tuna.tsinghua.edu.cn/help/homebrew/
+```
+export HOMEBREW_API_DOMAIN="https://mirrors.tuna.tsinghua.edu.cn/homebrew-bottles/api"
+export HOMEBREW_BOTTLE_DOMAIN="https://mirrors.tuna.tsinghua.edu.cn/homebrew-bottles"
+export HOMEBREW_BREW_GIT_REMOTE="https://mirrors.tuna.tsinghua.edu.cn/git/homebrew/brew.git"
+export HOMEBREW_CORE_GIT_REMOTE="https://mirrors.tuna.tsinghua.edu.cn/git/homebrew/homebrew-core.git"
+export HOMEBREW_PIP_INDEX_URL="https://pypi.tuna.tsinghua.edu.cn/simple"
+
+git clone --depth=1 https://mirrors.tuna.tsinghua.edu.cn/git/homebrew/install.git brew-install
+/bin/bash brew-install/install.sh
+rm -rf brew-install
+
+brew update
+```
+
+## create ssh tunnel
+
+```
+ssh -qTfnN -D 1080 root@example.com
+```
+
+* \-q: quiet模式，忽视大部分的警告和诊断信息（比如端口转发时的各种连接错误）
+* \-T: 禁用tty分配(pseudo-terminal allocation)
+* \-f: 登录成功后即转为后台任务执行
+* \-n: 重定向stdin为/dev/null，用于配合-f后台任务
+* \-N: 不执行远程命令（专门做端口转发）
+
+### git 设置 socks5 代理
+
+```
+git config --global http.proxy 'socks5://127.0.0.1:1080'
+git config --global https.proxy 'socks5://127.0.0.1:1080'
+
+git config --global --unset http.proxy
+git config --global --unset https.proxy
+```
+
+### npm 设置 socks5 代理
+
+```
+npm config set proxy socks5://127.0.0.1:1080
+npm config set https-proxy socks5://127.0.0.1:1080
+
+npm config delete proxy
+npm config delete https-proxy
+```
+
+### ssh 中位 github.com 设置 socks5 代理
+
+```
+vi ~/.ssh/config
+
+Host github.com
+    HostName github.com
+    User git
+    ProxyCommand nc -v -x 127.0.0.1:1080 %h %p
+```
+
+### bash 设置全局代理
+
+```
+export http_proxy="socks5://127.0.0.1:1080"
+export https_proxy="socks5://127.0.0.1:1080"
+
+# 取消所有 socks 代理
+unset all_proxy && unset ALL_PROXY
+```
 
 ## Shadowsocks
 
@@ -85,27 +174,4 @@ cat /etc/shadowsocks-libev/config.json
 sudo iptables -I INPUT -p tcp --dport 8388 -j ACCEPT
 sudo iptables -I INPUT -p udp --dport 8388 -j ACCEPT
 sudo ufw allow 8388
-
-```
-
-## create ssh tunnel
-
-```
-ssh -qTfnN -D 1080 root@demo.seafile.com
-
-```
-
-* \-q: quiet模式，忽视大部分的警告和诊断信息（比如端口转发时的各种连接错误）
-* \-T: 禁用tty分配(pseudo-terminal allocation)
-* \-f: 登录成功后即转为后台任务执行
-* \-n: 重定向stdin为/dev/null，用于配合-f后台任务
-* \-N: 不执行远程命令（专门做端口转发）
-
-## config proxy for npm
-```
-npm config set proxy socks5://127.0.0.1:1081
-npm config set https-proxy socks5://127.0.0.1:1081
-
-npm config delete proxy
-npm config delete https-proxy
 ```