We flaunt about various inventions and discoveries that we have done in in modern world. Especially the West, without realizing that these existed way back as per our Indian Tradition. Just that we had done injustice by not having understood the methodology based on which the technologies were developed and having lost the technique to reproduce them. Hence we could not claim that we had them already with us during the times these were rediscovered. The main reason for this being our misfortune and our ignorance and our attitude towards our own rich heritage. We kept ignoring them and respecting that which is outside our tradition.
Below I give list of such examples.
1) Pushpaka Vimana - Used by Ravan to abduct Sita Devi. This Vimana travelled in air and cross the ocean to take Sita Devi from India to Srilanka. This was many centuries before aeroplane was invented. Many more used such vimanas during the period.
2) Brahmastra - Used by Arujna during the Mahabarath wars way before the nuclear weapons were invented. Many more such astras existed.
3) Sajayan seeing the Mahabarath war happening at a distance from home - Classic example of telescope.
4) Auto recording of Vishnu Sahasra Nama when it was recited by Bheeshma to Yudishtra by the Spatikamani that Nakula was wearing.Example of record and play back.
5) Surrogate Father hood - Seen in case of Vyasa fathering Dritarastra and Pandu as requested by Sathyavathi.
6) IVF - Birth of 100 Sons to Gandhari. The actual gestation of 100 sons from flesh is still not discovered by modern medicine yet. May be will be discovered some day.
7) Classification of plant species in Ayurveda way before modern Herbarium.
List goes on.
There are many more concepts that are found, which are waiting for modern inventions to happen, as the methodology and technology was lost
1) Method Krishna used to give Saree to Draupadi continuously from a remote place.
2) Method used by Hanuman Ji to lift the Sanjeevini Mountain and sail through the air holding it.
3) Method by which Sita Devi was born from the Boomi and went inside the Boomi.
4) Method by which Draupadi and DhritaDhyuman were born from Fire.
Here again the list goes on.