This is the fourth weekly post for technological research. Week 4 will end at Midnight 23:59 GMT on Sunday the 25th of June, so please submit your tech before then!

To research tech, please reply to this post with 1. Your research for this week, 2. Links to any relevant RP supporting these techs, 3. A brief summary of any relevant RP, 4. Links to any examples of diplomacy with your trade partners from whom you’re diffusing techs, and 5. A brief summary of your trade/diplomacy.

Before replying, make sure you have updated the master tech sheet with your techs for the last week.

Please also check out this week's Megathread for additional details.

Please structure your reply like this:

A Slots: Kilns,

Tl;dr: The growing importance of ceramics as a status symbol led the Test People to develop kilns to better fire their ceramics. Meanwhile, population pressures and urbanization led to intensified farming on the slopes of the Test Hills. This led to the development of terracing, discussed in LINK TO POST.

B Slots: Trellises, Ash Glazed Pottery, Charcoal, Clay Shingles & Tiling

Tl;dr: Trellises allow for beans to be grown directly beside terrace walls, the other techs are tied to the changes in pottery culture: with charcoal production tied to the production of ash glazes.

C Slots: Sunken Basket Traps, empty, empty, empty, empty, empty, empty, empty.

Tl;dr: Neighbours A, B, and C all have Sunken Basket Traps. I did diplomacy with them here, LINK TO POST.

For Week Four, all players have access to One A Slot, Five B Slots, and Eight C Slots.

Cultures which have adopted writing in previous weeks gain access to one additional B Slot and two additional C Slots which can only be used with cultures which share your writing system.

All cultures which share a writing system have 1 spread points when diffusing from other cultures which use the same writing system.

As part of the crisis, cultures who successfully respond to it may receive an additional A Slot to fill with a relevant tech. Please tag /u/SandraSandraSandra in a comment to a crisis post which discusses the response to receive the slot.