science-geography: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/science-geography - from package: science-geography

You may install the required package with command apt-get install {package}

Error in other languages:
science-geography: bevel nie gevind nie
science-geography: comandă negăsită
science-geography: comando não encontrado
science-geography: commande introuvable
science-geography: command not found
science-geography: käsku ei ole
science-geography: không tìm thấy lệnh
science-geography: komanda nerasta
science-geography: Kommando nicht gefunden.
science-geography: kommandot finns inte
science-geography: komut yok
science-geography: nie znaleziono polecenia
science-geography: níor aimsíodh an t-ordú
science-geography: no se encontró la orden
science-geography: no s'ha trobat l'ordre
science-geography: opdracht niet gevonden
science-geography: parancs nem található
science-geography: perintah tidak ditemukan
science-geography: príkaz nenájdený
science-geography: příkaz nenalezen
science-geography: команда не найдена
science-geography: командата не е открита
science-geography: 命令找不到
science-geography: コマンドが見つかりません